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A206021 T(n,k) = number of (n+1) X (k+1) 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases. 9
104, 680, 680, 4440, 7688, 4440, 29000, 87448, 87448, 29000, 189400, 996840, 1763560, 996840, 189400, 1237000, 11364568, 35846696, 35846696, 11364568, 1237000, 8079000, 129573608, 729589784, 1312173688, 729589784, 129573608 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

......104.........680..........4440............29000.............189400

......680........7688.........87448...........996840...........11364568

.....4440.......87448.......1763560.........35846696..........729589784

....29000......996840......35846696.......1312173688........48253100168

...189400....11364568.....729589784......48253100168......3222294559864

..1237000...129573608...14856355384....1777528400280....216074701653640

..8079000..1477339224..302535915752...65511284596104..14510530142894840

.52765000.16844007528.6161045831496.2414878151153112.975067532289817432

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..144

EXAMPLE

Some solutions for n=3, k=3:

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

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

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

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

CROSSREFS

Sequence in context: A250692 A250676 A250677 * A206014 A106298 A337145

Adjacent sequences:  A206018 A206019 A206020 * A206022 A206023 A206024

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Feb 02 2012

STATUS

approved

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Last modified May 17 19:51 EDT 2022. Contains 353778 sequences. (Running on oeis4.)