A266996 - OEIS

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.

6, 23, 126, 943, 8360, 87289, 1073932, 14863289, 227066403, 3688250645, 62544807055, 1087937056186, 19275800685449, 345623392929734, 6258184177158268, 114122197400700402, 2094043644897109885

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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