25044

Appears in sequences

• a(n) = (n - 1)*(a(n - 2) - a(n - 3) + 1), a(0) = a(1) = a(2) = 1.at n=13A121989
• Number of ways to place n nonattacking composite pieces rook + rider[2,2] on an n X n chessboard.at n=8A189838
• L.g.f. L(x) = Sum_{n>=1} a(n)*x^n/n satisfies: exp(L(x)) = 1 + x*exp( Sum_{n>=1} a(n)*exp(L(x^n))*x^n/n ).at n=11A226908
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 435", based on the 5-celled von Neumann neighborhood.at n=31A272151
• Number of broken 2-diamond partitions of n.at n=16A328540