Number of nX4 arrays of occupancy after each element stays put or moves to some king-move neighbor, with every occupancy equal to zero or two.
A221336
Number of nX4 arrays of occupancy after each element stays put or moves to some king-move neighbor, with every occupancy equal to zero or two.
Terms
- a(0) =4a(1) =68a(2) =790a(3) =10704a(4) =142792a(5) =1937900a(6) =26264018a(7) =356533300a(8) =4838763426a(9) =65677043240a(10) =891388869206
External references
- oeis: A221336