a(n) = 1 + Sum_{k=0..n-1} binomial(n,k)^2 * a(k).
A335946
a(n) = 1 + Sum_{k=0..n-1} binomial(n,k)^2 * a(k).
Terms
- a(0) =1a(1) =2a(2) =10a(3) =110a(4) =2154a(5) =65902a(6) =2903446a(7) =174109546a(8) =13636888810
External references
- oeis: A335946
A335946
a(n) = 1 + Sum_{k=0..n-1} binomial(n,k)^2 * a(k).