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

Terms

a(0) =1a(1) =2a(2) =6a(3) =16a(4) =42a(5) =104a(6) =252a(7) =600a(8) =1402a(9) =3218a(10) =7282a(11) =16288a(12) =36048a(13) =78988a(14) =171516a(15) =369416a(16) =789762a(17) =1676818a(18) =3537622a(19) =7419544a(20) =15475756a(21) =32112968a(22) =66313088a(23) =136312608a(24) =279000612a(25) =568732738a(26) =1154881834a(27) =2336565080a(28) =4710930856a(29) =9466623964