98847

Appears in sequences

• Triangle read by rows: T(n,k) is the number of endofunctions on [n] whose second-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-1).at n=27A350079
• Number of polyhedra (3-polytopes) of graph radius 1 on n edges.at n=28A355638
• a(n) = Sum_{k=0..n} binomial(4*n+1,k) * binomial(2*n-k,n-k).at n=5A385639