a(n) = Sum_{k = 0..n} binomial(n,k)*trinomial(n,k), where trinomial(n,k) = trinomial coefficients.

A082759

a(n) = Sum_{k = 0..n} binomial(n,k)*trinomial(n,k), where trinomial(n,k) = trinomial coefficients.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =35a(4) =160a(5) =752a(6) =3599a(7) =17446a(8) =85376a(9) =420884a(10) =2087008a(11) =10398016a(12) =52010479a(13) =261021854a(14) =1313707256a(15) =6628095035a(16) =33512880640a(17) =169768235840a(18) =861450392708

External references