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A209912 Half the number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock having two or four distinct clockwise edge differences. 1
31926146, 78298719958, 174099838817590, 395928291655518846, 896278100477366851795, 2032217168415654090395276, 4605826850905941430535864352, 10440431207754050038448850990818 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A209913.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A209913.

Sequence in context: A052097 A252356 A153752 * A290264 A206043 A157080

Adjacent sequences:  A209909 A209910 A209911 * A209913 A209914 A209915

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 15 2012

STATUS

approved

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Last modified May 24 21:08 EDT 2022. Contains 354043 sequences. (Running on oeis4.)