A183727 1/12 the number of (n+1) X 8 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

16731, 388998, 8439116, 200260149, 4858574535, 134020420595, 5585215240568, 460509744129719, 54842127230404464, 7095042727449540024, 920742012786042810982, 118354309394343482912431

Offset: 1

Author

R. H. Hardin, Jan 06 2011

Keywords

• nonn

Comments

Column 7 of A183729.

Examples

			Some solutions with the first block increasing clockwise for 3 X 8:
..1..2..1..3..2..1..3..2....1..2..1..0..2..1..2..1....1..2..1..2..1..2..1..0
..0..5..0..4..5..0..4..0....0..3..4..5..4..5..4..0....0..4..5..4..5..3..4..5
..1..3..2..3..2..1..3..1....1..2..1..0..3..2..3..2....2..3..1..3..1..2..1..0
...
...R..L..R..L..L..R..L.......R..L..L..R..L..R..L.......R..L..R..L..R..L..L...
...L..R..L..R..R..L..R.......L..R..R..L..R..L..R.......L..R..L..R..L..R..R...
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..18