2886057

Appears in sequences

• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.at n=8A145938
• Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 2 X 2 elbow 1,1 1,2 2,1 in any orientation.at n=18A145940
• Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 2 X 2 elbow 1,1 1,2 2,1 in any orientation.at n=19A145940