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

A349769

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

Terms

    a(0) =1a(1) =2a(2) =7a(3) =31a(4) =143a(5) =686a(6) =3417a(7) =17382a(8) =89791a(9) =470134a(10) =2487593a(11) =13273921a(12) =71341921a(13) =385786298a(14) =2097096263a(15) =11451611919a(16) =62784274623a(17) =345436875758

External references