11566800

Appears in sequences

• a(n) = n*A029767(n-1).at n=9A052840
• Triangle T(n,k) of number of labeled directed multigraphs (with loops), without isolated vertices, with n arrows and k vertices (n = 1,2,.., k = 1..2*n).at n=38A120945
• Dimension of 4-variable non-commutative harmonics (Hausdorff derivative). The dimension of the space of non-commutative polynomials in 4 variables which are killed by all symmetric differential operators (where for a monomial w, d_{xi} ( w ) = sum over all subwords of w deleting xi once).at n=12A122393
• Numbers k such that k and k+1 are both terms in A377385.at n=20A377455