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A205657 Number of (n+1)X7 0..3 arrays with every 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors and no 2 X 2 subblock having the same number of counterclockwise edge increases as its vertical neighbors. 1
7854572, 76028256, 711793356, 10795687000, 183567605276, 2994560119488, 54588666013136, 946322990916328, 17957465680336828, 316121808578717168, 6072355548317464448, 107584942896241083216, 2075883483766878489344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A205659.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..36

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Sequence in context: A319809 A347424 A214194 * A206186 A205368 A235222

Adjacent sequences: A205654 A205655 A205656 * A205658 A205659 A205660

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 30 2012

STATUS

approved

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Last modified December 6 21:00 EST 2022. Contains 358648 sequences. (Running on oeis4.)