39176

Appears in sequences

• Triangle: Number of asymmetric semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).at n=24A058170
• a(n) = 5*a(n-1)+a(n-2)-2*a(n-3).at n=7A120464
• Number of n X (n+3) arrays of permutations of n+3 copies of 0..n-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo n and the upper left element equal to 0.at n=4A267331
• Number of 5Xn arrays containing n copies of 0..5-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 5 and the upper left element equal to 0.at n=7A267334
• Expansion of e.g.f. exp(-1 + Product_{k>=1} (1 + x^k/k!)).at n=8A308336