a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * binomial(k+6,6) * binomial(2*k,2*(n-k)).

A391779

a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * binomial(k+6,6) * binomial(2*k,2*(n-k)).

Terms

    a(0) =1a(1) =14a(2) =154a(3) =2688a(4) =34608a(5) =387744a(6) =4189920a(7) =42410496a(8) =408280992a(9) =3787340480a(10) =33960764992a(11) =295868561408

External references