22861440

Appears in sequences

• Expansion of e.g.f. 1/(1-x-2*x^3).at n=9A052610
• a(n) = product of nonzero digits of n! (A000142).at n=21A067067
• Number of cells in the 2nd rows of all deco polyominoes of height n. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=9A134437
• Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments.at n=43A249247
• Triangle read by rows: T(n,k) is the coefficient of x^(2*k) in the cycle polynomial of the complete bipartite graph K_{n,n}, 1 <= k <= n.at n=40A291909