A183737 1/16 the number of (n+1) X 9 0..7 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.

287769879, 659741463420, 1270931982853879, 3094892136980310870, 8974005118250282637773

Offset

1,1

Comments

Column 8 of A183738.

Links

Table of n, a(n) for n=1..5.

Example

Some solutions with the first block increasing clockwise for 3 X 9:
..0..1..0..1..0..6..1..6..7....0..1..0..1..0..7..0..6..7
..3..2..3..2..4..5..3..4..2....3..2..3..2..4..5..2..3..1
..0..1..0..1..0..6..1..5..0....0..1..0..1..0..6..7..4..7
...
...R..L..R..L..L..R..L..R.......R..L..R..L..L..R..L..R...
...L..R..L..R..R..L..R..L.......L..R..L..R..R..L..R..L...

Crossrefs

Sequence in context: A344519 A345720 A346361 * A234807 A204055 A344364

Adjacent sequences: A183734 A183735 A183736 * A183738 A183739 A183740

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved