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

Terms

a(0) =1a(1) =8a(2) =44a(3) =184a(4) =662a(5) =2120a(6) =6256a(7) =17276a(8) =45277a(9) =113568a(10) =274592a(11) =643220a(12) =1465838a(13) =3260428a(14) =7097338a(15) =15153288a(16) =31791822a(17) =65645360a(18) =133584864a(19) =268213400a(20) =531879490a(21) =1042657088a(22) =2022113788a(23) =3882468712a(24) =7384455791a(25) =13921287616a(26) =26026092198a(27) =48273051172a(28) =88868177735