Number of n X n symmetric binary matrices containing no more than four 1s in any 3 X 3 sub-block.
A139014
Number of n X n symmetric binary matrices containing no more than four 1s in any 3 X 3 sub-block.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =32a(4) =314a(5) =5328a(6) =141832a(7) =6811777a(8) =564010260a(9) =79061881217
External references
- oeis: A139014