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A147186 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01110-00011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 7, 9, 31, 55, 787, 1573, 22701, 53447, 1146545, 3177491, 131825683, 433244499, 34337767649, 134703759045, 16271838583281, 75677568824871, 14799633241575103, 81580228946827257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..24.

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

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A085903 A200180 A147248 * A131623 A032011 A272434

Adjacent sequences:  A147183 A147184 A147185 * A147187 A147188 A147189

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 28 18:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)