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A266996 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its west, northeast or northwest neighbor modulo 4 and the upper left element equal to 0. 1
6, 23, 126, 943, 8360, 87289, 1073932, 14863289, 227066403, 3688250645, 62544807055, 1087937056186, 19275800685449, 345623392929734, 6258184177158268, 114122197400700402, 2094043644897109885 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A266994.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=6

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

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

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

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

CROSSREFS

Cf. A266994.

Sequence in context: A013258 A013264 A063383 * A013263 A013259 A012468

Adjacent sequences:  A266993 A266994 A266995 * A266997 A266998 A266999

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 08 2016

STATUS

approved

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Last modified January 22 16:23 EST 2020. Contains 331152 sequences. (Running on oeis4.)