344201domain: NAppears in sequencesNumber of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.at n=15A146042Number of length n+2 0..3 arrays with no consecutive three elements summing to more than 3.at n=11A241609