Number of n X n symmetric binary matrices containing no more than seven 1s in any 3 X 3 sub-block.

A139017

Number of n X n symmetric binary matrices containing no more than seven 1s in any 3 X 3 sub-block.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =60a(4) =906a(5) =27189a(6) =1613401a(7) =189475577a(8) =44047431458

External references