Expansion of (-1 + Product_{k>=1} (1 + x^k)^k)^7.

Terms

a(0) =1a(1) =14a(2) =119a(3) =756a(4) =3969a(5) =18102a(6) =74102a(7) =278161a(8) =972447a(9) =3202521a(10) =10022705a(11) =30013914a(12) =86475340a(13) =240787680a(14) =650356936a(15) =1709167922a(16) =4381936874a(17) =10984062425a(18) =26971690900a(19) =64986689201a(20) =153866265007a(21) =358443604177a(22) =822523519244