2735810

Appears in sequences

• Number of diagonal dissections of a convex n-gon into n-4 regions.at n=9A002055
• Numbers k such that k*sigma(k)*sigma(sigma(k)) is a square.at n=27A116004
• Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors equal to 2.at n=9A197055
• Number of words of length 2n such that all letters of the denary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting doublets into the initially empty word.at n=1A258497