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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. 0
287769879, 659741463420, 1270931982853879, 3094892136980310870, 8974005118250282637773 (list; graph; refs; listen; history; text; internal format)
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: A320878 A320879 A214155 * A234807 A204055 A251566

Adjacent sequences:  A183734 A183735 A183736 * A183738 A183739 A183740

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified August 6 10:01 EDT 2020. Contains 336245 sequences. (Running on oeis4.)