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A147160 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 9, 25, 53, 97, 275, 939, 2977, 11455, 54387, 273381, 1565737, 8740687, 56416565, 398132663 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.0.1.1

.1.1.0.0.1.1.1.0

.0.1.1.1.0.1.0.0

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.0.0.1.0.1.1.1.0

.0.1.1.1.0.0.1.1

.1.1.0.0.0.0.0.1

CROSSREFS

Sequence in context: A225322 A031162 A348232 * A336669 A239745 A269440

Adjacent sequences:  A147157 A147158 A147159 * A147161 A147162 A147163

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 24 13:06 EDT 2021. Contains 348231 sequences. (Running on oeis4.)