G.f.: (x/(1 - x)) * Product_{k>=1} ((1 + x^k)/(1 - x^k))^a(k).
A308227
G.f.: (x/(1 - x)) * Product_{k>=1} ((1 + x^k)/(1 - x^k))^a(k).
Terms
- a(0) =1a(1) =3a(2) =11a(3) =47a(4) =217a(5) =1065a(6) =5453a(7) =28789a(8) =155633a(9) =857207a(10) =4793103a(11) =27136555a(12) =155249971a(13) =896133487a(14) =5212477023a(15) =30522169103a(16) =179777122393
External references
- oeis: A308227