a(n) = binomial(2*n - 1, n - 1)*(2*n)^n.
A367254
a(n) = binomial(2*n - 1, n - 1)*(2*n)^n.
Terms
- a(0) =1a(1) =2a(2) =48a(3) =2160a(4) =143360a(5) =12600000a(6) =1379524608a(7) =180889572864
External references
- oeis: A367254
A367254
a(n) = binomial(2*n - 1, n - 1)*(2*n)^n.