57188

Appears in sequences

• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 397", based on the 5-celled von Neumann neighborhood.at n=7A271690
• a(n) is the number of arches with a length of one and exactly one covering arch for semi-meanders with n top arches.at n=11A346757
• Numbers k such that k - A224787(k) is a square.at n=27A386623