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

A186414

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

Terms

    a(0) =1a(1) =2a(2) =24a(3) =500a(4) =13720a(5) =444528a(6) =16099776a(7) =631628712a(8) =26317863000

External references