a(n) = (14*n)!*(3*n)!/((9*n)!*(7*n)!*n!).A295447a(n) = (14*n)!*(3*n)!/((9*n)!*(7*n)!*n!).Terms a(0) =1a(1) =286a(2) =196650a(3) =152743696a(4) =125117624170External referencesoeis: A295447