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A266826 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west, northwest or southwest neighbor modulo 3 and the upper left element equal to 0. 1
1, 0, 1, 4, 10, 25, 45, 120, 399, 1108, 2923, 7991, 21953, 61747, 176646, 499952, 1409762, 3999661, 11391786, 32574598, 93459471, 268336007, 771070140, 2219952037, 6403510478, 18502345737, 53538515559, 155090741041, 449731074131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 3 of A266825.

LINKS

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

EXAMPLE

All solutions for n=4

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

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

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

CROSSREFS

Cf. A266825.

Sequence in context: A111153 A265438 A145368 * A111207 A298018 A254233

Adjacent sequences:  A266823 A266824 A266825 * A266827 A266828 A266829

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2016

STATUS

approved

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Last modified July 29 05:59 EDT 2021. Contains 346340 sequences. (Running on oeis4.)