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A147248 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11100-00100-00111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 7, 9, 31, 55, 549, 1047, 10041, 21681, 484881, 1255593, 40179283, 122480813, 7136007271, 25526356825, 2044413653787, 8531086609057, 1153670123416227, 5640169181500505, 1230123398597079731 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..25.

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

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A186234 A085903 A200180 * A147186 A131623 A032011

Adjacent sequences:  A147245 A147246 A147247 * A147249 A147250 A147251

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)