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A269506 Number of 2Xn arrays containing n copies of 0..2-1 avoiding the pattern down-up in every row and column. 2
2, 6, 14, 34, 92, 258, 722, 2022, 5706, 16232, 46442, 133418, 384550, 1111614, 3221582, 9357450, 27233148, 79394646, 231822854, 677835636, 1984435484, 5816254262, 17064740572, 50114985298, 147303657830, 433319078074 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A269505.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..1..0..0..1. .0..0..1..1. .0..1..1..0. .0..0..1..1. .0..0..1..0

..0..1..1..0. .1..1..0..0. .1..1..0..0. .1..0..0..1. .0..1..1..1

CROSSREFS

Cf. A269505.

Sequence in context: A186523 A177790 A307068 * A292816 A105635 A178320

Adjacent sequences:  A269503 A269504 A269505 * A269507 A269508 A269509

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 28 2016

STATUS

approved

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Last modified March 4 23:13 EST 2021. Contains 341812 sequences. (Running on oeis4.)