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A266862 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north or southwest neighbor modulo 3 and the upper left element equal to 0. 2
1, 4, 17, 66, 324, 1565, 7908, 41440, 219394, 1181538, 6433652, 35322999, 195435804, 1087909500, 6087937840, 34225256140, 193178201178, 1094225487556, 6217602330366, 35429358636014, 202398423255902, 1158911705466210 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A266861.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A266861.

Sequence in context: A244616 A030529 A323921 * A239845 A081113 A114587

Adjacent sequences:  A266859 A266860 A266861 * A266863 A266864 A266865

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2016

STATUS

approved

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Last modified October 17 15:01 EDT 2019. Contains 328116 sequences. (Running on oeis4.)