a(n) = (6*n+1) * (2*n)!^3 / n!^6.A376228a(n) = (6*n+1) * (2*n)!^3 / n!^6.Terms a(0) =1a(1) =56a(2) =2808a(3) =152000a(4) =8575000a(5) =496093248a(6) =29188893888External referencesoeis: A376228