a(n) = binomial(2*n,n)^4/(n + 1).A186419a(n) = binomial(2*n,n)^4/(n + 1).Terms a(0) =1a(1) =8a(2) =432a(3) =40000a(4) =4802000a(5) =672126336a(6) =104133351168External referencesoeis: A186419