372663domain: NAppears in sequencesNumber of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.at n=10A146128Numbers k such that {k^2 + 2, k^2 + 4} and {k^3 + 2, k^3 + 4} are twin prime pairs.at n=21A283698