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A147168 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 13, 37, 67, 147, 499, 1519, 5231, 22885, 101333, 548323, 3012179, 18194005, 121163279, 875290875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.1.1.1

.1.0.0.0.1.1.0.1

.1.1.0.0.1.0.0.0

.0.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.0

.0.0.0.1.0.0.1.1

.1.0.1.1.0.0.0.1

.1.1.1.0.0.0.1.1

CROSSREFS

Sequence in context: A113115 A107136 A153009 * A147183 A254955 A098547

Adjacent sequences:  A147165 A147166 A147167 * A147169 A147170 A147171

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 22 05:55 EST 2019. Contains 329388 sequences. (Running on oeis4.)