112690097

Appears in sequences

• Expansion of e.g.f. exp(-x)/(1-2*x).at n=9A000354
• Numerators of convergents to 1 + 2/(3 + 4/(5 + 6/(7 + ...))).at n=8A113012
• Form the difference table of the sequence {2^k*k!}, then divide k-th column entries by 2^k*k!. Array read by ascending antidiagonals, T(n, k) for n, k >= 0.at n=45A143410
• Double subfactorials: a(n) = (-1)^floor(n/2) * n!! * Sum_{i=0..floor(n/2)} (-1)^i/(n-2*i)!!.at n=18A334578
• Triangle read by rows: T(n,k) is the number of symmetries of the n-dimensional hypercube that fix exactly 2*k facets; n,k >= 0.at n=45A342381