A183711 1/20 of the number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

2, 17, 224, 5362, 224640, 16823812, 2239265280, 532844962952, 226169896329216, 171735135418632976, 232966965220983791616, 565591167958003196615968, 2455196078535760615522467840

Offset: 1

Author

R. H. Hardin, Jan 06 2011

Keywords

• nonn

Comments

Diagonal of A183719.

Examples

			Some solutions for 3 X 3:
..0..1..0....3..2..3....2..3..1....4..3..0....4..0..4....4..0..3....0..1..0
..3..2..3....4..0..4....1..4..0....1..2..1....2..1..2....2..1..2....4..3..4
..4..1..0....3..2..3....2..3..1....0..3..0....3..0..3....3..4..3....1..2..1
...
...R..L.......L..R.......R..L.......L..R.......R..L.......R..L.......R..L...
...L..R.......R..L.......L..R.......R..L.......L..R.......L..R.......L..R...