a(n) = Sum_{k=0..n} binomial(n,k)^2 * binomial(n+k,k) * 2^(n-k).
A382405
a(n) = Sum_{k=0..n} binomial(n,k)^2 * binomial(n+k,k) * 2^(n-k).
Terms
- a(0) =1a(1) =4a(2) =34a(3) =352a(4) =4006a(5) =48184a(6) =600916a(7) =7687936a(8) =100240198a(9) =1326277144a(10) =17753591164a(11) =239915864896
External references
- oeis: A382405