a(n) = (2n+0^n)*C(4n,2n).
A166337
a(n) = (2n+0^n)*C(4n,2n).
Terms
- a(0) =1a(1) =12a(2) =280a(3) =5544a(4) =102960a(5) =1847560a(6) =32449872a(7) =561632400a(8) =9617286240a(9) =163352435400
External references
- oeis: A166337
A166337
a(n) = (2n+0^n)*C(4n,2n).