80145

Appears in sequences

• Expansion of e.g.f. exp(x*exp(x)-x).at n=9A052506
• a(n) = (2*n - 1)*(7*n^2 - 7*n + 6)/6.at n=32A063490
• Triangle read by rows: T(n,k) = number of partial idempotent mappings (of an n-chain) with collapse exactly k.at n=54A259759
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x^k * (exp(x) - 1)).at n=64A292892
• Number of ways to write n as an ordered sum of ten powers of 2.at n=26A342254
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x^k/k! * (exp(x) - 1)).at n=64A355650
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = n! * Sum_{j=0..floor(n/2)} k^j * Stirling2(n-j,j)/(n-j)!.at n=64A361652
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = n! * Sum_{j=0..floor(n/2)} k^(n-j) * Stirling2(n-j,j)/(n-j)!.at n=64A362839