Expansion of Product_{k>=1} 1/(1-x^k)^(9*k).

Terms

a(0) =1a(1) =9a(2) =63a(3) =354a(4) =1755a(5) =7866a(6) =32682a(7) =127458a(8) =471681a(9) =1668313a(10) =5673501a(11) =18635229a(12) =59342520a(13) =183768255a(14) =554843493a(15) =1636855647a(16) =4727195028a(17) =13386032649a(18) =37219413972a(19) =101741003451a(20) =273721954086a(21) =725498278359