Product_{n>=1} (1 + x^n)^a(n) = g.f. of A000293 (solid partitions).

Terms

a(0) =1a(1) =4a(2) =6a(3) =14a(4) =15a(5) =26a(6) =26a(7) =48a(8) =46a(9) =83a(10) =97a(11) =146a(12) =112a(13) =49a(14) =-186a(15) =-448a(16) =-735a(17) =-485a(18) =779a(19) =3977a(20) =9323a(21) =16569a(22) =23056a(23) =23996a(24) =10116a(25) =-31501a(26) =-120720a(27) =-283153a(28) =-548924a(29) =-932348