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A147337 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 21, 61, 255, 1001, 4645, 25381, 168687, 1415389 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.1.1.0

.0.0.1.0.1.1.0.0

.0.0.1.1.0.1.0.0

.0.1.1.0.0.0.0.0

.1.1.0.0.0.0.0.0

.0.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A246327 A320896 A127989 * A020290 A020288 A147466

Adjacent sequences:  A147334 A147335 A147336 * A147338 A147339 A147340

KEYWORD

nonn,more

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 25 16:45 EDT 2020. Contains 337344 sequences. (Running on oeis4.)