a(n) = Sum_{k=0..n} binomial(2*n+2,k) * binomial(2*n-k-1,n-k).
A386835
a(n) = Sum_{k=0..n} binomial(2*n+2,k) * binomial(2*n-k-1,n-k).
Terms
- a(0) =1a(1) =5a(2) =30a(3) =198a(4) =1375a(5) =9843a(6) =71876a(7) =532220a(8) =3981645a(9) =30023265a(10) =227803642a(11) =1737227682a(12) =13303481035a(13) =102234258623a(14) =787997000640
External references
- oeis: A386835