A147496 - OEIS

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A147496

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11101-10111 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 45, 145, 605, 4313, 20593, 130161, 816717, 6861977, 63223597, 879585069, 10212102803

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.1.1.0.1

.1.0.0.1.0.1.1.1

.1.1.0.0.0.0.0.0

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.0.0.0.0.0.0.1.1

.1.1.1.0.1.0.0.1

.1.0.1.1.1.0.1.1

CROSSREFS

Sequence in context: A259665 A284285 A025624 * A147383 A276918 A127976

Adjacent sequences: A147493 A147494 A147495 * A147497 A147498 A147499

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved