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A147466 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 9, 21, 63, 297, 1127, 5413, 31109, 218667, 1954511, 18966855, 237663851, 3316716099, 56055493989 (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

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

.1.1.0.0.1.1.0.0

.1.1.0.0.1.1.0.0

.0.0.1.1.0.0.1.1

.0.0.1.1.0.0.1.1

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A147337 A020290 A020288 * A262055 A193276 A173084

Adjacent sequences:  A147463 A147464 A147465 * A147467 A147468 A147469

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 23 23:51 EDT 2019. Contains 328379 sequences. (Running on oeis4.)