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A183726 1/12 the number of (n+1) X 7 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
3070, 41423, 525895, 7319684, 112949014, 2740758406, 134020420595, 9546147995730, 729082624201394, 55559473375122011, 4177316401273489526, 310180873007618124181, 22791464284740341972598, 1660173775969136404275224 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A183729.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..59

EXAMPLE

Some solutions with the first block increasing clockwise for 3 X 7:

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

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

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

...

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

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

CROSSREFS

Sequence in context: A274411 A224970 A224116 * A137485 A251786 A262459

Adjacent sequences:  A183723 A183724 A183725 * A183727 A183728 A183729

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified September 18 12:45 EDT 2019. Contains 327170 sequences. (Running on oeis4.)