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A222720 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
6, 666, 88552, 12956013, 1928517786, 289452236157, 43727219083464, 6642633038715993, 1013931851324206903, 155405622159690335817, 23903771940011196629121, 3688080815279058966399672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A222722

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=3

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

..2..0..3..0....2..3..2..1....3..0..2..1....0..0..0..2....3..0..0..1

..1..0..0..0....0..2..3..3....1..0..2..3....0..2..3..1....2..1..1..0

CROSSREFS

Sequence in context: A220858 A337652 A222743 * A309597 A269842 A333639

Adjacent sequences:  A222717 A222718 A222719 * A222721 A222722 A222723

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 03 2013

STATUS

approved

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Last modified November 27 06:10 EST 2021. Contains 349363 sequences. (Running on oeis4.)