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A222375 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order 1
4, 18, 118, 1391, 20340, 342953, 6221698, 113556454, 2103238076, 38940850866, 724814585064, 13496985711211, 251700828899740, 4703187944642436, 87873606070564444, 1646203673458642042, 30815057060615530576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A222378

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A162224 A321704 A296982 * A053529 A005442 A306881

Adjacent sequences:  A222372 A222373 A222374 * A222376 A222377 A222378

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 17 2013

STATUS

approved

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Last modified July 24 04:25 EDT 2021. Contains 346273 sequences. (Running on oeis4.)