a(n) = binomial(2n,n)^4/(n+1)^3.A186416a(n) = binomial(2n,n)^4/(n+1)^3.Terms a(0) =1a(1) =2a(2) =48a(3) =2500a(4) =192080a(5) =18670176a(6) =2125170432a(7) =270968717448External referencesoeis: A186416