a(n) = n^n*binomial(2*n-1, n).

A293270

a(n) = n^n*binomial(2*n-1, n).

Terms

    a(0) =1a(1) =1a(2) =12a(3) =270a(4) =8960a(5) =393750a(6) =21555072a(7) =1413199788a(8) =107961384960

External references