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A222872 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
1, 11, 131, 2150, 32491, 533186, 8362152, 135650378, 2155759835, 34780282521, 555913562689, 8947148045345, 143379589806584, 2305060329759954, 36982483115935396, 594232174227590798, 9538759468134692551 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222878

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A061113 A261689 A101334 * A068645 A097258 A044041

Adjacent sequences:  A222869 A222870 A222871 * A222873 A222874 A222875

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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Last modified January 25 22:06 EST 2022. Contains 350572 sequences. (Running on oeis4.)