Expansion of Product_{k>=1} 1/(1 - x^k)^(k*(k+1)*(4*k-1)/6).

Terms

a(0) =1a(1) =1a(2) =8a(3) =30a(4) =108a(5) =357a(6) =1205a(7) =3838a(8) =12083a(9) =36896a(10) =110828a(11) =326281a(12) =946086a(13) =2700026a(14) =7602642a(15) =21128513a(16) =58028309a(17) =157588912a(18) =423534324a(19) =1127102360a(20) =2971764946a(21) =7766890826a(22) =20131080168a(23) =51766513279a(24) =132117237595a(25) =334770353022a(26) =842462217948