Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 horizontally, vertically or diagonally neighboring 1.
A191600
Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 horizontally, vertically or diagonally neighboring 1.
Terms
- a(0) =2a(1) =5a(2) =23a(3) =159a(4) =1646a(5) =28059a(6) =724310a(7) =29626607a(8) =1890041732a(9) =188477431884
External references
- oeis: A191600