80218

Appears in sequences

• a(n) = Sum_{k=0..n} binomial(n, k) * k! / floor(k/2)!.at n=9A018191
• Duplicate of A018191.at n=9A081126
• Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101.at n=14A259767
• Number of rooted trees with n nodes such that four equals the maximal number of subtrees of the same size extending from the same node.at n=13A318819