275592188347domain: NAppears in sequencesNumber of n X n binary arrays with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.at n=9A145925Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.at n=21A145927