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

Terms

a(0) =1a(1) =2a(2) =7a(3) =14a(4) =35a(5) =66a(6) =140a(7) =252a(8) =485a(9) =840a(10) =1512a(11) =2534a(12) =4347a(13) =7084a(14) =11705a(15) =18622a(16) =29862a(17) =46522a(18) =72779a(19) =111310a(20) =170534a(21) =256586a(22) =386101a(23) =572488a(24) =848050a(25) =1240974a(26) =1812979a(27) =2621486a(28) =3782669a(29) =5410360