A147106 - OEIS

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A147106

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

0

1, 1, 1, 1, 3, 7, 15, 37, 181, 733, 3563, 18321, 120179, 876663, 8507491, 85942209, 1181855975

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.1.1.1.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.1.1.1.0.0.0.1

.1.0.0.0.1.1.1.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.1.1.1.0.0.0.1

CROSSREFS

Sequence in context: A317881 A018020 A192472 * A078161 A216616 A230958

Adjacent sequences: A147103 A147104 A147105 * A147107 A147108 A147109

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved