Expansion of Product_{k>=1} (1 + x^k)^(k*(k+1)*(2*k+1)/6).

Terms

a(0) =1a(1) =1a(2) =5a(3) =19a(4) =54a(5) =165a(6) =467a(7) =1317a(8) =3599a(9) =9687a(10) =25519a(11) =66203a(12) =169254a(13) =426750a(14) =1062950a(15) =2616818a(16) =6373911a(17) =15369774a(18) =36716706a(19) =86939235a(20) =204152395a(21) =475631501a(22) =1099874363a(23) =2525418842a(24) =5759549109a(25) =13050991205a(26) =29391523405a(27) =65801951770a(28) =146486952644a(29) =324340095729