a(0) = 1; a(n) = 2 * Sum_{k=0..n-1} binomial(n,k)^2 * a(k).
A336217
a(0) = 1; a(n) = 2 * Sum_{k=0..n-1} binomial(n,k)^2 * a(k).
Terms
- a(0) =1a(1) =2a(2) =18a(3) =362a(4) =12946a(5) =723402a(6) =58208490a(7) =6375093258a(8) =911949196434
External references
- oeis: A336217