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A147000 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 00100-00100-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 5, 1, 11, 3, 31, 8, 90, 23, 344, 61, 1429, 183, 6788, 609, 37364, 3021, 252513 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.1.1.1.0.1.1.1.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A126132 A129982 A052552 * A147486 A168018 A173238

Adjacent sequences:  A146997 A146998 A146999 * A147001 A147002 A147003

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 24 19:27 EST 2020. Contains 332209 sequences. (Running on oeis4.)