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

A339710

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

Terms

    a(0) =1a(1) =7a(2) =81a(3) =1051a(4) =14353a(5) =201807a(6) =2891409a(7) =41976627a(8) =615371169a(9) =9089130967a(10) =135048608401

External references