Number of n X n symmetric binary matrices containing no more than eight 1s in any 3 X 3 sub-block.
A139018
Number of n X n symmetric binary matrices containing no more than eight 1s in any 3 X 3 sub-block.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =63a(4) =993a(5) =31272a(6) =1966528a(7) =246968879a(8) =61940593841
External references
- oeis: A139018