Coefficient of x^n in Product_{k>=1} ((1+x^k)/(1-x^k))^(2*n).
A304447
Coefficient of x^n in Product_{k>=1} ((1+x^k)/(1-x^k))^(2*n).
Terms
- a(0) =1a(1) =4a(2) =40a(3) =448a(4) =5264a(5) =63624a(6) =783328a(7) =9770240a(8) =123040288a(9) =1561033348a(10) =19922193200a(11) =255472920256
External references
- oeis: A304447