225524

Appears in sequences

• Number of 2-dimensional directed compact animals of size n.at n=13A006801
• Number of ways to place 2 nonattacking kings on an n X n cylindrical chessboard.at n=25A194650
• The list of all prime numbers is split into sublists with the 1st sublist L_1 = {2} and n-th sublist L_n = {p_1, p_2, ..., p_m}. a(n) is the largest m such that the maximum prime gap in L_n is < p_1 - prevprime(p_1).at n=42A348178