84219

Appears in sequences

• Numbers k such that (2*k)!/(2*(k!)^2) - 1 is prime.at n=42A112861
• Number of rooted trees with n nodes such that seven equals the maximal number of subtrees of the same size extending from the same node.at n=13A318822
• Number of rooted trees with n nodes such that seven equals the maximal number of isomorphic subtrees extending from the same node.at n=13A318864