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

A067002

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

Terms

    a(0) =1a(1) =3a(2) =21a(3) =77a(4) =1155a(5) =4389a(6) =33649a(7) =129789a(8) =4023459a(9) =15646785a(10) =122044923a(11) =477084699a(12) =7474326951a(13) =29322359577a(14) =230389968105a(15) =906200541213

External references