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A222373 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order 2
1, 1, 5, 18, 63, 234, 1163, 4953, 24021, 109395, 536457, 2526558, 12324313, 59135699, 288057673, 1396084937, 6800380165, 33152287976, 161670473265, 790996243845, 3863624579433, 18948369852560, 92716137764021, 455475835479225 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A222378

LINKS

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

EXAMPLE

Some solutions for n=4

..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..1....0..1

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

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

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

CROSSREFS

Sequence in context: A033453 A284840 A301749 * A147535 A184309 A051944

Adjacent sequences:  A222370 A222371 A222372 * A222374 A222375 A222376

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 17 2013

STATUS

approved

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Last modified September 19 12:40 EDT 2020. Contains 337178 sequences. (Running on oeis4.)