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A266043 Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any vertical or antidiagonal neighbor equal to 3-1. 1
2, 8, 30, 146, 620, 3018, 14356, 72070, 366704, 1914616, 10149476, 54660630, 297665832, 1637684396, 9080967528, 50697416118, 284611241532, 1605400483260, 9092172075452, 51674059356836, 294578579777600, 1683830972093940 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A266042.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..105

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A266042.

Sequence in context: A026693 A150792 A302187 * A265950 A294264 A007468

Adjacent sequences:  A266040 A266041 A266042 * A266044 A266045 A266046

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved

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Last modified May 19 02:45 EDT 2019. Contains 323377 sequences. (Running on oeis4.)