Expansion of Product_{k>=1} (1 + x^(2*k-1))^(k*(3*k-1)/2)*(1 + x^(2*k))^(k*(3*k+1)/2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =13a(5) =30a(6) =61a(7) =125a(8) =250a(9) =494a(10) =960a(11) =1835a(12) =3487a(13) =6520a(14) =12105a(15) =22239a(16) =40515a(17) =73207a(18) =131315a(19) =233831a(20) =413625a(21) =727100a(22) =1270405a(23) =2207243a(24) =3814155a(25) =6557164a(26) =11217391a(27) =19099932a(28) =32375026a(29) =54640509