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A209857 1/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 1
3553425, 2383064182, 1538049629157, 1014683000461958, 665390868679472699, 437706800031436404447, 287490532338602681041344, 188980762791958451221301355, 124172412194974480096912519039 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A209858

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..164

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A209785 A244620 A202570 * A107349 A198167 A053078

Adjacent sequences:  A209854 A209855 A209856 * A209858 A209859 A209860

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2012

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)