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A147474 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 11, 35, 119, 483, 1553, 7807, 47813, 363745, 2696139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.1

.1.1.1.1.0.0.1.0

.0.0.1.1.0.0.1.0

.0.1.0.0.1.1.0.0

.0.1.0.0.1.1.1.1

.1.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A259400 A320087 A014335 * A247417 A222286 A119143

Adjacent sequences: A147471 A147472 A147473 * A147475 A147476 A147477

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified March 24 17:52 EDT 2023. Contains 361505 sequences. (Running on oeis4.)