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

Terms

a(0) =1a(1) =2a(2) =6a(3) =14a(4) =33a(5) =70a(6) =149a(7) =298a(8) =591a(9) =1132a(10) =2139a(11) =3948a(12) =7199a(13) =12894a(14) =22836a(15) =39894a(16) =68982a(17) =117948a(18) =199852a(19) =335426a(20) =558429a(21) =922112a(22) =1511610a(23) =2460208a(24) =3977963a(25) =6390942a(26) =10206862a(27) =16207444a(28) =25596941a(29) =40214896