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

A279013

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

Terms

    a(0) =1a(1) =2a(2) =8a(3) =35a(4) =161a(5) =768a(6) =3773a(7) =19006a(8) =97840a(9) =513264a(10) =2737121a(11) =14805805a(12) =81082383a(13) =448805300a(14) =2507310567a(15) =14120503129a(16) =80082573017a(17) =456977964520

External references