A183717 1/20 of the number of (n+1) X 8 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

408, 5776, 71712, 954496, 12606120, 168070828, 2239265280, 29887741084, 398877017736, 5325395568832, 71097798240000, 949288848361824, 12674717188992600, 169233802374938432, 2259618796412155200

Offset

1,1

Comments

Column 7 of A183719.

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 3 X 8:
..0..4..0..4..0..4..0..4....1..0..2..0..1..0..1..0....3..0..3..0..4..0..4..0
..2..3..1..2..1..2..1..2....3..4..3..4..2..4..2..3....2..1..2..1..3..1..3..2
..0..4..0..4..0..3..0..3....2..0..1..0..1..0..1..0....3..4..3..0..4..0..4..1
...
...L..R..L..R..L..R..L.......L..R..L..R..L..R..L.......R..L..R..L..R..L..R...
...R..L..R..L..R..L..R.......R..L..R..L..R..L..R.......L..R..L..R..L..R..L...

Crossrefs

Sequence in context: A234702 A234697 A337795 * A285767 A282479 A163024

Adjacent sequences: A183714 A183715 A183716 * A183718 A183719 A183720

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved