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A223146 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
10, 187, 4065, 84196, 1753639, 36926759, 788312639, 17055726949, 373400072400, 8256792930855, 184090480905482, 4132305583955186, 93275576521838179, 2115119659086818460, 48145683687395482000, 1099433387636066838881 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A223149

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..54

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A179521 A211102 A121973 * A239765 A006409 A173813

Adjacent sequences:  A223143 A223144 A223145 * A223147 A223148 A223149

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2013

STATUS

approved

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Last modified May 28 04:36 EDT 2020. Contains 334671 sequences. (Running on oeis4.)