a(n) = binomial(2n,n)^3/(n+1).

A186415

a(n) = binomial(2n,n)^3/(n+1).

Terms

    a(0) =1a(1) =4a(2) =72a(3) =2000a(4) =68600a(5) =2667168a(6) =112698432a(7) =5053029696a(8) =236860767000

External references