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

Terms

a(0) =1a(1) =1a(2) =6a(3) =25a(4) =78a(5) =258a(6) =800a(7) =2463a(8) =7344a(9) =21511a(10) =61677a(11) =173980a(12) =483319a(13) =1323470a(14) =3577605a(15) =9553658a(16) =25227727a(17) =65918419a(18) =170552866a(19) =437196640a(20) =1110945961a(21) =2799689792a(22) =7000246591a(23) =17372882671a(24) =42809388080a(25) =104774554942a(26) =254771953179a(27) =615667051237