17017969

Appears in sequences

• a(n) = 2*n*a(n-1) + 1 with a(0) = 1.at n=8A010844
• Square array, read by antidiagonals: form the Euler-Seidel matrix for the sequence {2^k*k!} and then divide column k by 2^k*k!.at n=36A143411
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of the e.g.f. exp(x)/(1 - k*x).at n=63A320031
• Triangle read by rows: T(n, k) = n! * 2^k * hypergeom([-k], [-n], 1/2).at n=44A374428