A183726 - OEIS

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.

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 A334256

Adjacent sequences: A183723 A183724 A183725 * A183727 A183728 A183729

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved