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

Terms

a(0) =1a(1) =0a(2) =1a(3) =3a(4) =7a(5) =13a(6) =28a(7) =52a(8) =107a(9) =203a(10) =396a(11) =741a(12) =1409a(13) =2596a(14) =4813a(15) =8777a(16) =15972a(17) =28737a(18) =51553a(19) =91644a(20) =162288a(21) =285377a(22) =499653a(23) =869758a(24) =1507615a(25) =2599974a(26) =4465606a(27) =7635607a(28) =13005252a(29) =22061424