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A187137 Number of (n+1)X7 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 0
72225, 18740754, 1921749372, 245891941002, 29716252404984, 3703181282209854, 456216633873575892, 56423240969024815416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A187140

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 4X7

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

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

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

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

CROSSREFS

Sequence in context: A187312 A080477 A234330 * A185842 A251348 A254911

Adjacent sequences:  A187134 A187135 A187136 * A187138 A187139 A187140

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 05 2011

STATUS

approved

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Last modified December 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)