Number of n X n symmetric binary matrices containing no more than six 1s in any 3 X 3 sub-block.
A139016
Number of n X n symmetric binary matrices containing no more than six 1s in any 3 X 3 sub-block.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =54a(4) =750a(5) =20314a(6) =1052864a(7) =105578342a(8) =20460453442
External references
- oeis: A139016