224481

Appears in sequences

• Total length of longest runs of 1's in all bitstrings of length n.at n=15A119706
• Number of length n+7 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.at n=14A255114
• Number of vertices formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).at n=33A331763
• a(0) = 1; a(n) = (1/n) * Sum_{k=1..n} binomial(n,k)^2 * binomial(k+1,2) * k * a(n-k).at n=6A352658