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A209856 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 1
492373, 155490654, 47417927307, 14741920546390, 4558499131132306, 1413503057063618368, 437706800031436404447, 135637740882655309176164, 42015985984488346140563741, 13017745880887035269283799043 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A209858

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A251972 A034629 A109914 * A234822 A082248 A166196

Adjacent sequences:  A209853 A209854 A209855 * A209857 A209858 A209859

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2012

STATUS

approved

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Last modified January 29 01:19 EST 2022. Contains 350670 sequences. (Running on oeis4.)