Coefficient of x^n in Product_{k>=1} 1/(1-x^k)^n.

Terms

a(0) =1a(1) =1a(2) =5a(3) =22a(4) =105a(5) =506a(6) =2492a(7) =12405a(8) =62337a(9) =315445a(10) =1605340a(11) =8207563a(12) =42124380a(13) =216903064a(14) =1119974875a(15) =5796944357a(16) =30068145905a(17) =156250892610a(18) =813310723925