37715

Appears in sequences

• Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.at n=7A145942
• a(n) = A066186(n) - A004125(n).at n=23A162362
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 35", based on the 5-celled von Neumann neighborhood.at n=38A269816