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A222881 Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
15, 2150, 443510, 95867967, 20978414941, 4643150795564, 1036481888251762, 232912437941917635, 52614561200004212957, 11936312777288007185980, 2717468404561524996790251, 620503805193057253513443782 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A222878

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A126681 A263162 A232196 * A229844 A208171 A266571

Adjacent sequences:  A222878 A222879 A222880 * A222882 A222883 A222884

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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Last modified May 18 22:37 EDT 2022. Contains 353826 sequences. (Running on oeis4.)