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

1,1

Comments

Column 7 of A183729.

Links

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

Example

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...

Crossrefs

Sequence in context: A181098 A365813 A202896 * A128383 A052190 A068784

Adjacent sequences: A183724 A183725 A183726 * A183728 A183729 A183730

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved