2093801

Properties

Appears in sequences

• Number of ordered rooted trees with n edges such that the rightmost leaf of each subtree is at even level. Equivalently, number of Dyck paths of semilength n with no return descents of odd length.at n=13A033297
• a(n) = smallest odd m such that (m^n + (m+2)^n)/2 is prime.at n=17A121923
• Prime numbersat n=155393