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

Terms

a(0) =1a(1) =1a(2) =6a(3) =21a(4) =70a(5) =210a(6) =646a(7) =1881a(8) =5446a(9) =15295a(10) =42355a(11) =115036a(12) =308312a(13) =814023a(14) =2123431a(15) =5471967a(16) =13949888a(17) =35194914a(18) =87952796a(19) =217803302a(20) =534794576a(21) =1302545064a(22) =3148316746a(23) =7554386885a(24) =18001627175a(25) =42613759083a(26) =100240372671a(27) =234371794954a(28) =544812235887