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A147034 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 25, 85, 499, 2253, 9751, 103141, 1030207, 12930523, 188986765, 3964919203, 79856104275, 2515127447393 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.0.1.1.1.0.0.1.0

.1.1.0.0.1.1.1.1

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.1.1.1.1.0.0.1.1

.0.1.0.0.1.1.1.0

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A018212 A181477 A147274 * A146460 A223840 A083090

Adjacent sequences:  A147031 A147032 A147033 * A147035 A147036 A147037

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 19 09:17 EDT 2018. Contains 316339 sequences. (Running on oeis4.)