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A222913 Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
0, 6, 18, 136, 654, 3972, 21778, 127226, 727214, 4237154, 24617576, 144049162, 843945398, 4961892900, 29226194746, 172530718840, 1020187713214, 6042341555988, 35837121558046, 212824919490178, 1265353059527832 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222918

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A208822 A003496 A009582 * A091054 A012774 A306656

Adjacent sequences:  A222910 A222911 A222912 * A222914 A222915 A222916

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 09 2013

STATUS

approved

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Last modified September 21 05:55 EDT 2020. Contains 337267 sequences. (Running on oeis4.)