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

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =27a(5) =79a(6) =231a(7) =675a(8) =1971a(9) =5755a(10) =16805a(11) =49071a(12) =143289a(13) =418411a(14) =1221781a(15) =3567663a(16) =10417761a(17) =30420401a(18) =88829145a(19) =259385701a(20) =757419669a(21) =2211704625a(22) =6458291945a(23) =18858546645a(24) =55067931981a(25) =160801210705a(26) =469547855419