91091

Appears in sequences

• Stirling numbers of first kind, s(n+3, n), negated.at n=10A001303
• Triangle read by rows: T(n,k) is the number of 2-stack sortable n-permutations with k runs.at n=49A082680
• Triangle read by rows: T(n,k) is the number of 2-stack sortable n-permutations with k runs.at n=50A082680
• Legendre-binomial transform of 10^n for p=3.at n=5A117611
• Numbers k which are concatenations k = x//y such that x^2 - y^2 is a multiple of k.at n=7A162701
• Number of, not necessarily connected, regular simple graphs on n vertices with girth at least 5.at n=22A185315
• Number of double-crossing set partitions of {1,...,n}.at n=11A306558