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A147179 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 565, 1145, 12479, 31399, 640435, 1895643, 107049481, 386487735, 48463219765, 218714170211, 47470279346001, 263294969585091, 82919443144541165, 560855115342510007 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A146587 A147256 A147163 * A146627 A146635 A146832

Adjacent sequences:  A147176 A147177 A147178 * A147180 A147181 A147182

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)