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

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =29a(5) =88a(6) =264a(7) =790a(8) =2366a(9) =7086a(10) =21216a(11) =63523a(12) =190201a(13) =569485a(14) =1705121a(15) =5105383a(16) =15286247a(17) =45769238a(18) =137039743a(19) =410316854a(20) =1228548190a(21) =3678451550a(22) =11013817655a(23) =32976968175a(24) =98737827756a(25) =295635383297a(26) =885175234817