268736
domain: N
Appears in sequences
- Numbers n such that n and 2^n end with the same 4 digits.at n=26A067867
- a(n) = Sum_{k=0..n} (k+1)^2*T(n,k)^2 where T(n,k) is the Catalan triangle A039598.at n=5A228329
- Number of enriched p-trees of weight n with distinct leaves.at n=31A300354
- a(n) = (2n^2 - n + 2) * (2n)! / ((n + 1) * (n + 2) * n!^2).at n=9A349695