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A187134 Number of (n+1)X4 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 1
405, 19062, 267840, 5755698, 99203418, 1921749372, 34994620836, 658156407930, 12168728064540, 227006548039242, 4215046606416756, 78456814617739176, 1458483057478165140, 27130892560870689198, 504514738674275619150 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A187140

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 6X4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A224527 A219147 A239541 * A185839 A285924 A285860

Adjacent sequences:  A187131 A187132 A187133 * A187135 A187136 A187137

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 05 2011

STATUS

approved

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Last modified December 4 02:18 EST 2020. Contains 338921 sequences. (Running on oeis4.)