a(n) = Sum_{j = 0..2*n} binomial(n+j-1,j)*2^j.

A333561

a(n) = Sum_{j = 0..2*n} binomial(n+j-1,j)*2^j.

Terms

    a(0) =1a(1) =7a(2) =129a(3) =2815a(4) =65537a(5) =1579007a(6) =38862849a(7) =970522623a(8) =24494735361a(9) =623210135551

External references