Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 horizontally, vertically or diagonally neighboring 1s.
A191604
Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 horizontally, vertically or diagonally neighboring 1s.
Terms
- a(0) =2a(1) =8a(2) =62a(3) =966a(4) =29888a(5) =1838552a(6) =224969616a(7) =54745613520
External references
- oeis: A191604