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A222879 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
2, 11, 122, 1814, 26311, 399849, 6013669, 91842381, 1400573929, 21492587457, 330100781811, 5085688832352, 78450837933529, 1212393597214424, 18758126651572197, 290589347000277975, 4505965014075887115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A222878

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

EXAMPLE

Some solutions for n=3

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

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

CROSSREFS

Sequence in context: A057076 A251663 A118794 * A247736 A155928 A001946

Adjacent sequences:  A222876 A222877 A222878 * A222880 A222881 A222882

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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Last modified September 17 17:27 EDT 2019. Contains 327136 sequences. (Running on oeis4.)