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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. 2
16731, 388998, 8439116, 200260149, 4858574535, 134020420595, 5585215240568, 460509744129719, 54842127230404464, 7095042727449540024, 920742012786042810982, 118354309394343482912431 (list; graph; refs; listen; history; text; internal format)
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: A186311 A181098 A202896 * A128383 A052190 A068784

Adjacent sequences:  A183724 A183725 A183726 * A183728 A183729 A183730

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified October 17 14:23 EDT 2019. Contains 328113 sequences. (Running on oeis4.)