G.f.: x * Product_{j>=1, k>=1} ((1 + x^(j*k))/(1 - x^(j*k)))^a(j).

A308152

G.f.: x * Product_{j>=1, k>=1} ((1 + x^(j*k))/(1 - x^(j*k)))^a(j).

Terms

    a(0) =1a(1) =2a(2) =8a(3) =32a(4) =138a(5) =612a(6) =2864a(7) =13712a(8) =67416a(9) =337482a(10) =1716208a(11) =8837392a(12) =45997032a(13) =241571408a(14) =1278625480a(15) =6813568656a(16) =36524390042a(17) =196820310100

External references