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A147240 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 31, 655, 1339, 18309, 48007, 1442201, 4567021, 367217353, 1460020323, 228615404039, 1133359885719, 280150745688529, 1717585325345099, 785288102542995777, 5945777223826707809 (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

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A087764 A146691 A146784 * A147210 A146816 A146659

Adjacent sequences:  A147237 A147238 A147239 * A147241 A147242 A147243

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 12 04:52 EDT 2022. Contains 356067 sequences. (Running on oeis4.)