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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.
1
9403, 550268, 32555965, 3202350892, 470757143497, 85938883577009, 16327766532728500, 3094892136980310870, 579019469263278106043, 106955380615838654906545, 19539849220501390068072761
OFFSET
1,1
COMMENTS
Column 4 of A183738.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved