Expansion of Product_{j>=1} (1 + j*(-1 + Product_{k>=1} (1 + k*x^k))^j).
A307566
Expansion of Product_{j>=1} (1 + j*(-1 + Product_{k>=1} (1 + k*x^k))^j).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =18a(4) =72a(5) =289a(6) =1119a(7) =4301a(8) =16408a(9) =62313a(10) =234914a(11) =879822a(12) =3274623a(13) =12125348a(14) =44707778a(15) =164258803a(16) =601535222a(17) =2195926654a(18) =7990792367a(19) =28985219498a(20) =104811279467a(21) =377875493610
External references
- oeis: A307566