A183724 1/12 the number of (n+1) X 5 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.

87, 388, 1790, 14886, 272215, 7319684, 200260149, 5355252106, 139489865583, 3561214845505, 89499710973670, 2221523267475056, 54589402697720455, 1330321340313497085, 32193928583886647023, 774480659129262018036

Offset

1,1

Comments

Column 4 of A183729.

Links

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

Example

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

Crossrefs

Sequence in context: A243580 A219723 A033631 * A221312 A098139 A359341

Adjacent sequences: A183721 A183722 A183723 * A183725 A183726 A183727

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved