a(n) = (6*n)!*(2*n)!/((4*n)!*(3*n)!*n!).

A211419

a(n) = (6*n)!*(2*n)!/((4*n)!*(3*n)!*n!).

Terms

    a(0) =1a(1) =10a(2) =198a(3) =4420a(4) =104006a(5) =2521260a(6) =62300700a(7) =1560167752a(8) =39457579590

External references