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A222643 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
1, 1, 3, 12, 38, 124, 430, 1530, 5378, 18938, 67042, 238446, 849586, 3033214, 10851386, 38895414, 139634834, 502003486, 1807104810, 6512929766, 23498319154, 84864219966, 306764487338, 1109807490550, 4018136484386, 14558333191406 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A222649

LINKS

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

EXAMPLE

All solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A320203 A217093 A278639 * A129014 A261384 A055294

Adjacent sequences:  A222640 A222641 A222642 * A222644 A222645 A222646

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 27 2013

STATUS

approved

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Last modified February 16 12:48 EST 2019. Contains 320163 sequences. (Running on oeis4.)