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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =8a(5) =32a(6) =153a(7) =883a(8) =5980a(9) =46660a(10) =411861a(11) =4057263a(12) =44104688a(13) =524243696a(14) =6762188285a(15) =94055795999