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

Terms

a(0) =1a(1) =0a(2) =2a(3) =6a(4) =13a(5) =32a(6) =69a(7) =160a(8) =344a(9) =760a(10) =1601a(11) =3384a(12) =7022a(13) =14434a(14) =29361a(15) =59140a(16) =118089a(17) =233754a(18) =459293a(19) =895382a(20) =1733904a(21) =3334914a(22) =6374654a(23) =12111632a(24) =22881777a(25) =42993244a(26) =80362496a(27) =149464404a(28) =276657082a(29) =509740278