Coefficient of x^n in Product_{k>=1} ((1 + x^k) / (1 - x^k))^n.
A270919
Coefficient of x^n in Product_{k>=1} ((1 + x^k) / (1 - x^k))^n.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =80a(4) =552a(5) =3912a(6) =28224a(7) =206208a(8) =1520784a(9) =11297546a(10) =84413912a(11) =633713808a(12) =4776117216a(13) =36115518376a(14) =273868321536
External references
- oeis: A270919