Number of nX4 0..1 arrays with every element unequal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318218
Number of nX4 0..1 arrays with every element unequal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =18a(3) =174a(4) =1538a(5) =13722a(6) =123415a(7) =1108310a(8) =9952342a(9) =89374736a(10) =802604215a(11) =7207554901a(12) =64725391117a(13) =581247882251
External references
- oeis: A318218