Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A320405
Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =8a(1) =35a(2) =156a(3) =786a(4) =3761a(5) =18725a(6) =92578a(7) =463045a(8) =2308299a(9) =11536977a(10) =57665448a(11) =288255915a(12) =1441171251a(13) =7205071761a(14) =36023566370a(15) =180108084412a(16) =900499990791
External references
- oeis: A320405