75303

Appears in sequences

• T(n,n+2), array T as in A047110.at n=9A047117
• Number of n X n symmetric binary matrices containing no more than one 1 in any 2 X 2 sub-block.at n=8A139006
• 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=15A141486
• 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=18A141486