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A223128 Number of 3Xn 0..2 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
5, 72, 1154, 28907, 444555, 11814919, 186184618, 5048458186, 80664693231, 2214177564958, 35719743830427, 988031616090509, 16048574199166554, 446266480581619794, 7286115298409479410, 203387498405308227681 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A223126

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A092204 A079874 A186664 * A079340 A268782 A282788

Adjacent sequences: A223125 A223126 A223127 * A223129 A223130 A223131

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 15 2013

STATUS

approved

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Last modified December 9 04:13 EST 2022. Contains 358698 sequences. (Running on oeis4.)