Number of nXn 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317816
Number of nXn 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =5a(2) =35a(3) =702a(4) =8556a(5) =296968a(6) =7370716a(7) =384248160a(8) =21424520640
External references
- oeis: A317816