a(n) = 2*Sum_{k=0..n-1} binomial(n,k)^2*binomial(n,k+1)^2.

A334237

a(n) = 2*Sum_{k=0..n-1} binomial(n,k)^2*binomial(n,k+1)^2.

Terms

    a(0) =2a(1) =16a(2) =198a(3) =2368a(4) =30100a(5) =392544a(6) =5248782a(7) =71501056a(8) =989177508a(9) =13859716000a(10) =196282985756

External references