Sequences

Squares and cubes.

Number of ways of getting a royal flush, other straight flush, 4 of a kind, full house, other flush, other straight, 3 of a kind, 2 pair, a pair or nothing in 5-card poker.

Number of bipartite partitions.

Number of bipartite partitions.

Number of bipartite partitions.

Number of bipartite partitions.

Number of bipartite partitions.

Number of bipartite partitions.

Number of bipartite partitions.

Discriminants of totally real quartic fields (see comments).

Integers connected with coefficients in expansion of Weierstrass P-function.

Number of terms in a skew determinant: a(n) = (A000085(n) + A081919(n))/2.

Number of terms in a bordered skew determinant.

Number of nonisomorphic simple matroids (or geometries) with n points.

Number of bipartite partitions of n white objects and n black ones.

a(n) = n^2 * n!.

Terms in certain determinants.

Restricted permutations.

Numbers whose square is a palindrome.

Palindromic squares.

Numbers whose cube is a palindrome.

Palindromic cubes.

Concatenate the natural numbers, then partition into minimal strings so that each term divides the next.

a(n) = 2*(3^n - 2^n) + 1.

A problem in parity.

Number of self-complementary oriented graphs with n nodes.

Semigroups of order n with 1 idempotent, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Number of semigroups of order n with 2 idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Idempotent semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Number of integer points in a certain quadrilateral scaled by a factor of n.

Denominators of Cauchy numbers of second type (= Bernoulli numbers B_n^{(n)}).

a(n) = Sum_{d|n, d <= 4} d^2 + 4*Sum_{d|n, d>4} d.

Erroneous version of A108919.

a(n) = 2n*a(n-1) - (n-1)^2*a(n-2).

Numerators of convergents to Lehmer's constant.

Denominators of convergents to Lehmer's constant.

Numbers that are divisible by each nonzero digit.

Number of solutions to a linear inequality.

a(n) = a(n-1) + a(n-2) - a(n-3).

Number of 4-line partitions of n (i.e., planar partitions of n with at most 4 lines).

Erroneous version of A001157.

a(n) = (2*n-1)*a(n-1) - (n-1)*a(n-2) with a(0) = a(1) = 1.

a(n) = (2*n+3)!/(6*n!*(n+1)!).

a(n) = (2n+4)!/(4!*n!*(n+1)!).

(Presumed) solution to Waring's problem: g(n) = 2^n + floor((3/2)^n) - 2.

a(n) = denominator of harmonic number H(n) = Sum_{i=1..n} 1/i.

Number of ways of getting nothing, a pair, 2 pair, 3 of a kind, other straight, other flush, full house, 4 of a kind, other straight flush, or a royal flush in 5-card poker.

a(n) = Sum_{k=3..n} (k-1)!*C(n,k)/2.

The composite numbers: numbers n of the form x*y for x > 1 and y > 1.

Increasing values of A000793 (largest order of permutation of n elements).