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A266868 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west or northeast neighbor modulo 3 and the upper left element equal to 0. 2
2, 4, 17, 57, 207, 786, 3057, 12168, 49161, 200973, 830381, 3462433, 14543365, 61455313, 261051074, 1114132113, 4775036853, 20540793414, 88645205402, 383652117835, 1664756627492, 7241001588378, 31563853315709, 137860267982920 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A266867.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A266867.

Sequence in context: A018269 A270359 A276557 * A203177 A096122 A014522

Adjacent sequences:  A266865 A266866 A266867 * A266869 A266870 A266871

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2016

STATUS

approved

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Last modified January 27 05:19 EST 2021. Contains 340451 sequences. (Running on oeis4.)