68976

Appears in sequences

• A simple grammar. a(n)=n*A052873(n-1).at n=6A052857
• Constant term in the reduction of the polynomial (x+2)^n by x^3->x^2+x+1. See Comments.at n=10A192801
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 533", based on the 5-celled von Neumann neighborhood.at n=40A272784
• a(n) = Sum_{k = n..2*n+1} k^2.at n=30A299646
• Expansion of Sum_{k>=1} k * x^k / (1 - k * x^k)^k.at n=19A324159
• Numbers k such that abs(A328258(k)) = abs(A328258(k+1)).at n=37A348586
• Number of 3 X 3 matrices with unit determinant and nonnegative integer entries whose sum is n.at n=25A361083
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of 1/sqrt(1 - 4*k*x - 4*x^2).at n=41A386621
• Expansion of 1/sqrt(1 - 12*x - 4*x^2).at n=5A387428