Expansion of (1/(1 - x)) * Sum_{k>=0} x^(k*(2*k+1)) / Product_{j=1..2*k} (1 - x^j).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =7a(7) =10a(8) =13a(9) =17a(10) =22a(11) =28a(12) =35a(13) =44a(14) =55a(15) =68a(16) =84a(17) =103a(18) =126a(19) =153a(20) =185a(21) =223a(22) =268a(23) =320a(24) =381a(25) =452a(26) =535a(27) =631a(28) =742a(29) =870