a(n) = binomial(6*n, 3*n)*binomial(3*n, n)/(2*(2*n+1)*binomial(2*n, n)).

A176898

a(n) = binomial(6*n, 3*n)*binomial(3*n, n)/(2*(2*n+1)*binomial(2*n, n)).

Terms

    a(0) =5a(1) =231a(2) =14586a(3) =1062347a(4) =84021990a(5) =7012604550a(6) =607892634420

External references