73108domain: NAppears in sequencesNumber of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.at n=12A147082Number of 6-cycles in the n X n knight graph.at n=26A289181G.f. A(x) satisfies A(x) = 1 / (1 - x * (1 + x + x^2) * A(x^3)).at n=17A367652