1133287

Properties

Appears in sequences

• Number of n X n symmetric binary matrices containing no more than one 1 in any 2 X 2 sub-block.at n=9A139006
• Number of n X n binary matrices, symmetric about the diagonal and under 90-degree rotation, with no more than 1 one in any 2 X 2 subblock.at n=17A141486
• Number of n X n binary matrices, symmetric about the diagonal and under 90-degree rotation, with no more than 1 one in any 2 X 2 subblock.at n=20A141486
• Prime numbersat n=88126