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A147288 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation. 0
1, 1, 1, 1, 5, 13, 29, 101, 617, 3357, 20865, 140793, 1290919, 15614005, 229745285, 3898534669 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.1.1.1.0.0

.1.0.0.0.0.1.0.0

.1.1.1.0.0.1.1.0

.0.0.1.1.0.0.1.0

.0.1.0.0.1.1.0.0

.0.1.1.0.0.1.1.1

.0.0.1.0.0.0.0.1

.0.0.1.1.1.0.0.1

CROSSREFS

Sequence in context: A147278 A268963 A147349 * A146420 A147492 A182069

Adjacent sequences:  A147285 A147286 A147287 * A147289 A147290 A147291

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 25 09:51 EDT 2021. Contains 348239 sequences. (Running on oeis4.)