Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318015
Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =64a(1) =4105a(2) =37700a(3) =603215a(4) =7960400a(5) =109443619a(6) =1493271874a(7) =20443576030a(8) =279709797313
External references
- oeis: A318015