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A183711 1/20 of the number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease. 0
2, 17, 224, 5362, 224640, 16823812, 2239265280, 532844962952, 226169896329216, 171735135418632976, 232966965220983791616, 565591167958003196615968, 2455196078535760615522467840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A183719.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for 3 X 3:

..0..1..0....3..2..3....2..3..1....4..3..0....4..0..4....4..0..3....0..1..0

..3..2..3....4..0..4....1..4..0....1..2..1....2..1..2....2..1..2....4..3..4

..4..1..0....3..2..3....2..3..1....0..3..0....3..0..3....3..4..3....1..2..1

...

...R..L.......L..R.......R..L.......L..R.......R..L.......R..L.......R..L...

...L..R.......R..L.......L..R.......R..L.......L..R.......L..R.......L..R...

CROSSREFS

Sequence in context: A004029 A114268 A144208 * A058239 A006227 A307289

Adjacent sequences:  A183708 A183709 A183710 * A183712 A183713 A183714

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified November 28 13:42 EST 2021. Contains 349412 sequences. (Running on oeis4.)