a(n) = Sum_{k=0..n} binomial(2*k, k) * binomial(2*n+1, 2*k).
A273055
a(n) = Sum_{k=0..n} binomial(2*k, k) * binomial(2*n+1, 2*k).
Terms
- a(0) =1a(1) =7a(2) =51a(3) =393a(4) =3139a(5) =25653a(6) =212941a(7) =1787607a(8) =15134931a(9) =128996853a(10) =1105350729a(11) =9513228123a(12) =82176836301a(13) =712070156203
External references
- oeis: A273055