220185

Appears in sequences

• Expansion of e.g.f. exp(-x^2/2) / (1-x).at n=9A000266
• Triangle T(n,k) = number of permutations of n elements with k 2-cycles.at n=25A114320
• Triangle T(n,k), the number of permutations on n elements that have no cycles of length k.at n=37A122974