Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303620
Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =20a(2) =68a(3) =325a(4) =1870a(5) =10741a(6) =62207a(7) =363485a(8) =2135551a(9) =12586013a(10) =74323727a(11) =439462339a(12) =2600501501a(13) =15395919313a(14) =91177465195a(15) =540072985865
External references
- oeis: A303620