Expansion of Product_{k>=1} (1 + k^2*x^k)^k.

Terms

a(0) =1a(1) =1a(2) =8a(3) =35a(4) =107a(5) =421a(6) =1312a(7) =4474a(8) =13622a(9) =43977a(10) =130473a(11) =388025a(12) =1146640a(13) =3265446a(14) =9352424a(15) =26033637a(16) =72144351a(17) =196664848a(18) =532768901a(19) =1422725368a(20) =3768251677a(21) =9893857617a(22) =25709347054a(23) =66367179293a(24) =169754459790a(25) =431237516979