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A183724 1/12 the number of (n+1) X 5 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
87, 388, 1790, 14886, 272215, 7319684, 200260149, 5355252106, 139489865583, 3561214845505, 89499710973670, 2221523267475056, 54589402697720455, 1330321340313497085, 32193928583886647023, 774480659129262018036 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A183729.

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 5:

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

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

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

...

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

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

CROSSREFS

Sequence in context: A243580 A219723 A033631 * A221312 A098139 A297509

Adjacent sequences:  A183721 A183722 A183723 * A183725 A183726 A183727

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified October 15 07:38 EDT 2019. Contains 328026 sequences. (Running on oeis4.)