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A222686 Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
3, 18, 220, 3189, 47696, 723244, 11082863, 171281610, 2665243912, 41702927217, 655500979620, 10342682216196, 163717383474715, 2598721367092734, 41349332751064456, 659312336958352181, 10532234884132194040 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A222690

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..183

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A279233 A071605 A340336 * A274271 A195765 A195766

Adjacent sequences:  A222683 A222684 A222685 * A222687 A222688 A222689

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2013

STATUS

approved

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Last modified October 24 20:35 EDT 2021. Contains 348233 sequences. (Running on oeis4.)