Expansion of (-1 + Product_{k>=1} 1 / (1 + (-x)^k))^3.

Terms

a(0) =1a(1) =0a(2) =3a(3) =3a(4) =6a(5) =9a(6) =13a(7) =21a(8) =27a(9) =40a(10) =54a(11) =75a(12) =97a(13) =129a(14) =171a(15) =220a(16) =282a(17) =360a(18) =460a(19) =576a(20) =720a(21) =896a(22) =1116a(23) =1374a(24) =1682a(25) =2061a(26) =2517a(27) =3050a(28) =3684a(29) =4449