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A183732 1/16 the number of (n+1) X 4 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. 1
563, 13169, 469254, 32555965, 2610816897, 211915469907, 16635894447271, 1270931982853879, 94993985142144635, 6981985010723242050, 506415863251104840544, 36341705193868254651896, 2585229289237578869949797 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A183738.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions with the first block increasing clockwise for 3 X 4:

..3..6..4..3....4..5..4..3....5..1..7..6....2..4..6..4....5..1..0..7

..1..0..1..2....0..7..0..1....3..2..3..4....1..0..7..0....4..3..4..5

..5..7..6..3....5..6..4..3....6..1..7..5....4..5..6..4....5..2..0..7

...

...R..L..L.......R..L..L.......R..L..L.......R..R..L.......R..L..L...

...L..R..R.......L..R..R.......L..R..R.......L..L..R.......L..R..R...

CROSSREFS

Sequence in context: A142759 A187849 A237029 * A014361 A274471 A252293

Adjacent sequences:  A183729 A183730 A183731 * A183733 A183734 A183735

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified September 22 12:19 EDT 2019. Contains 327307 sequences. (Running on oeis4.)