a(n) = Sum_{k = 0..n} binomial(n+k-1, k)^2.
A333592
a(n) = Sum_{k = 0..n} binomial(n+k-1, k)^2.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =146a(4) =1742a(5) =22252a(6) =296438a(7) =4063866a(8) =56884430a(9) =808970960a(10) =11649069764a(11) =169444272692
External references
- oeis: A333592