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A147061 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01010-11111 pattern in any orientation. 0
1, 1, 1, 1, 5, 1, 10, 1, 26, 1, 220, 25, 1716, 153, 23943, 1076, 485243, 13889, 10665112, 185108, 364094762, 4253039, 18497655767, 156271576, 1302420306077, 7383352471 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.1.1.1.1.0.0

.0.0.0.1.0.1.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.0.0.1.0.0.0.1.0.0

.0.0.0.1.0.1.0.0.0

.0.0.1.1.1.1.1.0.0

CROSSREFS

Sequence in context: A329373 A147362 A147225 * A147386 A145759 A131414

Adjacent sequences:  A147058 A147059 A147060 * A147062 A147063 A147064

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 12 16:32 EDT 2022. Contains 356077 sequences. (Running on oeis4.)