Expansion of Product_{k>=1} 1/(1 - 4*k*x^k).

Terms

a(0) =1a(1) =4a(2) =24a(3) =108a(4) =512a(5) =2164a(6) =9464a(7) =39004a(8) =163008a(9) =663588a(10) =2713752a(11) =10954764a(12) =44328512a(13) =178160724a(14) =716821752a(15) =2874497660a(16) =11532111232a(17) =46187508676a(18) =185028540696a(19) =740595436652