a(n) = Sum_{k=0..n} binomial(2k,k)^3 * binomial(2n-2k,n-k) * 2^(4*(n-k)).
A300116
a(n) = Sum_{k=0..n} binomial(2k,k)^3 * binomial(2n-2k,n-k) * 2^(4*(n-k)).
Terms
- a(0) =1a(1) =40a(2) =2008a(3) =109120a(4) =6173656a(5) =357903040a(6) =21090174400
External references
- oeis: A300116