editing

approved

Cf. A001787, A006116, A022166.

proposed

editing

editing

proposed

a(n) = (2^n - 1)*A006116(n-1).

approved

editing

reviewed

approved

proposed

reviewed

editing

proposed

0, 1, 6, 35, 240, 2077, 23562, 358775, 7449060, 213188689, 8473977534, 470309723435, 36582636406680, 3998655357260293, 615328930033081458, 133485330929459963615, 40859530900982506959180, 17659495180812130332490681, 10781678259164073608877557286, 9301770545157096607562560360595, 11342605398267103214358288554515200

Michel Marcus: Data section a bit too big

a(n) = Sum_{k=1..n}} A022166(n,k)*(2^k - 1).

proposed

editing

editing

proposed

Geoffrey Critzer: Yes, thank you.