a(n) = A002426(n)*A000984(n); product of central trinomial coefficients and central binomial coefficients.

A216584

a(n) = A002426(n)*A000984(n); product of central trinomial coefficients and central binomial coefficients.

Terms

    a(0) =1a(1) =2a(2) =18a(3) =140a(4) =1330a(5) =12852a(6) =130284a(7) =1348776a(8) =14247090a(9) =152618180a(10) =1654120468a(11) =18096447096a(12) =199536967084

External references