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A147512 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation. 0
1, 1, 1, 1, 5, 9, 25, 59, 279, 1153, 8111, 46003, 371173, 2930355, 33533835, 383283501 (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

.1.1.1.1.0.0.0.1

.0.1.1.1.1.0.1.1

.0.0.0.0.0.0.1.1

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.1.1.0.0.0.0.0.0

.1.1.0.1.1.1.1.0

.1.0.0.0.1.1.1.1

CROSSREFS

Sequence in context: A147286 A137199 A221567 * A301960 A050359 A062812

Adjacent sequences:  A147509 A147510 A147511 * A147513 A147514 A147515

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified June 24 20:32 EDT 2022. Contains 354830 sequences. (Running on oeis4.)