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A222887 Number of nX4 0..2 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order 1
6, 184, 8986, 465938, 24893100, 1351294947, 74202775749, 4110642829357, 229305087108268, 12863027320889786, 724874553417397463, 41005626962099741403, 2327182744071959475216, 132441294546405471753370 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A222889

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..44

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A064120 A041429 A089905 * A012208 A012181 A012224

Adjacent sequences:  A222884 A222885 A222886 * A222888 A222889 A222890

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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Last modified September 23 22:32 EDT 2020. Contains 337315 sequences. (Running on oeis4.)