19760

Appears in sequences

• Number of bipartite partitions.at n=17A002763
• Number of nonzero elements in the character table of the symmetric group S_n.at n=14A006908
• a(n) = 2*binomial(n,3).at n=40A007290
• Number of k's such that A002034(k) = n.at n=20A038024
• Numbers with exactly one arithmetic progression of four successive divisors (not necessarily consecutive).at n=18A094530
• Triangle read by rows: T(n,k) is the coefficient of t^k (k >= 1) in the polynomial P[n,t] defined by P[1,t] = P[2,t] = t, P[n,t] = P[n-1,t] + P^2[n-2,t].at n=56A103484
• a(n) = A104908(n) - 100*A104803(n).at n=24A104910
• Number of partitions of n such that the largest part is coprime to every other part.at n=43A130690
• G.f. satisfies A(x) = 1 + x*(1 + x*A(x)^2)^5.at n=7A137961
• 13 times pentagonal numbers: a(n) = 13*n*(3*n-1)/2.at n=32A153793
• Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique.at n=16A170813
• Number of (w,x,y,z) with all terms in {1,...,n} and 2|w-x|=n+|y-z|.at n=39A212686
• Numbers n such that n^1+n+1, n^2+n+1, n^3+n+1 and n^4+n+1 are all prime.at n=17A219117
• Size of the smallest conjugacy class of size greater than 1 of the alternating group of degree n.at n=36A237036
• Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=17A240793
• Numbers x = concat(a,b) such that b^a begins with the digits of x.at n=12A266817
• Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section.at n=19A286783
• Column 3 of A286783.at n=2A287043
• 1/15840 of the volume of a primitive 3-simplex.at n=8A295507
• 3d-congruent numbers: positive integers n for which there exists a trirectangular tetrahedron having volume n and rational areas and sides.at n=32A297207