20486

Appears in sequences

• Number of isomorphism classes of commutative monoids (commutative semigroups with identity) of order n.at n=8A058131
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={0,1}.at n=20A080007
• Numbers k such that the representation of k^2 is a substring of that of k!, in base 10.at n=9A113621
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 1, -1), (0, 1, 1), (1, 0, 0), (1, 0, 1)}.at n=7A151140
• Row sums of the Riordan matrix (1/sqrt(1-4*x), x/(1-x)) (A187888).at n=8A188622
• The growth series for the affine Coxeter (or Weyl) group [3,3,5] (or H_4).at n=37A266783
• The eventual period of a sequence b(n, m) where b(n, 1) = 1 and the m-th term is the number of occurrences of b(n, m-1) in the list of integers from b(n, max(m-n, 1)) to b(n, m-1).at n=32A334539
• Consecutive states of the linear congruential pseudo-random number generator 172*s mod 30307 when started at s=1.at n=16A385032