a(n) = Sum_{k=0..n-1} binomial(6*k,k) * binomial(6*n-6*k-2,n-k-1).

A386368

a(n) = Sum_{k=0..n-1} binomial(6*k,k) * binomial(6*n-6*k-2,n-k-1).

Terms

    a(0) =0a(1) =1a(2) =16a(3) =246a(4) =3736a(5) =56421a(6) =849432a(7) =12763878a(8) =191548464a(9) =2871970110a(10) =43031833656a(11) =644432826478

External references