a(n) = Sum_{k = 0..n} binomial(n+k-1,k)^2 * binomial(2*n-2*k,n-k) * binomial(2*k,k).
A364111
a(n) = Sum_{k = 0..n} binomial(n+k-1,k)^2 * binomial(2*n-2*k,n-k) * binomial(2*k,k).
Terms
- a(0) =1a(1) =4a(2) =76a(3) =2560a(4) =106060a(5) =4864504a(6) =237354880a(7) =12079462560a(8) =633885607500
External references
- oeis: A364111