A183733 1/16 the number of (n+1) X 5 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.

9403, 550268, 32555965, 3202350892, 470757143497, 85938883577009, 16327766532728500, 3094892136980310870, 579019469263278106043, 106955380615838654906545, 19539849220501390068072761

Offset

1,1

Comments

Column 4 of A183738.

Links

R. H. Hardin, Table of n, a(n) for n = 1..58

Example

Some solutions with the first block increasing clockwise for 3 X 5:
..0..1..2..0..2....0..3..2..3..4....4..6..0..3..7....4..6..2..3..4
..7..4..3..6..5....7..6..0..6..5....3..2..1..2..1....3..0..1..7..6
..6..5..1..0..2....3..5..2..3..4....4..5..7..4..5....4..6..2..3..5
...
...R..R..L..R.......R..L..R..R.......R..R..L..R.......R..L..R..R...
...R..L..R..L.......L..R..L..L.......L..L..R..L.......L..R..L..L...

Crossrefs

Sequence in context: A202645 A183796 A362879 * A290424 A210082 A330838

Adjacent sequences: A183730 A183731 A183732 * A183734 A183735 A183736

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved