Number of nX2 arrays of occupancy after each element moves to some king-move neighbor, without move-in move-out left turns.
A221600
Number of nX2 arrays of occupancy after each element moves to some king-move neighbor, without move-in move-out left turns.
Terms
- a(0) =1a(1) =19a(2) =140a(3) =1206a(4) =10020a(5) =84160a(6) =705156a(7) =5912277a(8) =49563492a(9) =415515336a(10) =3483440165a(11) =29203220338a(12) =244823382148
External references
- oeis: A221600