Number of n X n symmetric binary matrices containing no more than five 1s in any 3 X 3 sub-block.
A139015
Number of n X n symmetric binary matrices containing no more than five 1s in any 3 X 3 sub-block.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =44a(4) =530a(5) =11951a(6) =480173a(7) =36013602a(8) =4995124766
External references
- oeis: A139015