754977953

Appears in sequences

• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.at n=12A145928
• Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.at n=27A145930