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

Terms

a(0) =1a(1) =1a(2) =5a(3) =14a(4) =40a(5) =101a(6) =266a(7) =649a(8) =1593a(9) =3765a(10) =8813a(11) =20168a(12) =45649a(13) =101591a(14) =223654a(15) =486046a(16) =1045541a(17) =2225167a(18) =4692421a(19) =9804734a(20) =20318249a(21) =41766843a(22) =85218989a(23) =172628766a(24) =347338117a(25) =694330731a(26) =1379437080a(27) =2724353422a(28) =5350185097a(29) =10449901555