191910369845
domain: N
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=11A145938
- 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=24A145940
- 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=25A145940