Expansion of (-1 + Product_{k>=1} 1 / (1 - x^k))^4.

Terms

a(0) =1a(1) =8a(2) =36a(3) =124a(4) =362a(5) =944a(6) =2266a(7) =5100a(8) =10903a(9) =22340a(10) =44168a(11) =84692a(12) =158137a(13) =288452a(14) =515344a(15) =903740a(16) =1558465a(17) =2646820a(18) =4432964a(19) =7329916a(20) =11977507a(21) =19358524a(22) =30970444a(23) =49077936a(24) =77081679a(25) =120054268a(26) =185514428a(27) =284540060a(28) =433360308a(29) =655622392