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

Terms

a(0) =1a(1) =3a(2) =15a(3) =54a(4) =210a(5) =699a(6) =2484a(7) =7995a(8) =26610a(9) =84186a(10) =269940a(11) =839238a(12) =2634579a(13) =8098194a(14) =25032282a(15) =76388265a(16) =233791104a(17) =709501596a(18) =2157488730a(19) =6523204836a(20) =19747491810a(21) =59558682132a(22) =179762506329a(23) =541222906812