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A222849 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order 2
1, 7, 51, 391, 2894, 22491, 173099, 1351439, 10562301, 83067164, 654664840, 5177288283, 41027782738, 325853413087, 2592430133475, 20658531950143, 164850585115958, 1317141294092889, 10535656551412625, 84359922128250860 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222853

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A147958 A104454 A332936 * A273055 A019472 A219306

Adjacent sequences:  A222846 A222847 A222848 * A222850 A222851 A222852

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 07 2013

STATUS

approved

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)