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A266456 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north neighbor modulo 3 and the upper left element equal to 0. 2
1, 5, 39, 357, 3471, 35003, 362265, 3821877, 40918431, 443234475, 4847042025, 53425329675, 592800026625, 6615155585925, 74183656771239, 835491101084757, 9445356930180735, 107140324945955483, 1218962144543118009 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A266455.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..93

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A266455.

Sequence in context: A244039 A213233 A115187 * A247772 A129763 A277424

Adjacent sequences:  A266453 A266454 A266455 * A266457 A266458 A266459

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

STATUS

approved

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Last modified February 24 12:35 EST 2018. Contains 299623 sequences. (Running on oeis4.)