a(n) = 1 + 1*n + 1*n*2 + 1*n*2*(n-1) + 1*n*2*(n-1)*3 + 1*n*2*(n-1)*3*(n-2) + ... + n!.
A123636
a(n) = 1 + 1*n + 1*n*2 + 1*n*2*(n-1) + 1*n*2*(n-1)*3 + 1*n*2*(n-1)*3*(n-2) + ... + n!.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =37a(5) =176a(6) =979a(7) =6658a(8) =50873a(9) =451180a(10) =4376911a(11) =47740694a(12) =560586613a(13) =7248848608a(14) =99837660875
External references
- oeis: A123636