Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318011
Number of nX3 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) =4a(1) =28a(2) =118a(3) =508a(4) =2130a(5) =8971a(6) =37700a(7) =158613a(8) =667178a(9) =2806643a(10) =11806334a(11) =49664719a(12) =208919728a(13) =878843413a(14) =3696948061a(15) =15551606501a(16) =65419489183a(17) =275194053961
External references
- oeis: A318011