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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =19a(6) =41a(7) =88a(8) =189a(9) =405a(10) =869a(11) =1864a(12) =3998a(13) =8575a(14) =18392a(15) =39448a(16) =84610a(17) =181475a(18) =389235a(19) =834848a(20) =1790617a(21) =3840591a(22) =8237462a(23) =17668057a(24) =37895195a(25) =81279216a(26) =174331098a(27) =373912708a(28) =801983781a(29) =1720128713