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A183725 1/12 the number of (n+1) X 6 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. 1
537, 4170, 30939, 272215, 3723606, 112949014, 4858574535, 221403152762, 9949950285008, 439077020908186, 19070687313534907, 817844594324788300, 34712759917922473170, 1460861248287305883035, 61042039866448977229798 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A183729.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..125

EXAMPLE

Some solutions with the first block increasing clockwise for 3 X 6:

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

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

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

...

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

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

CROSSREFS

Sequence in context: A033916 A236879 A206067 * A235780 A235785 A235561

Adjacent sequences:  A183722 A183723 A183724 * A183726 A183727 A183728

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified October 16 20:55 EDT 2019. Contains 328103 sequences. (Running on oeis4.)