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A147491 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11101-10111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 137, 137, 521, 521, 6501, 6501, 70441, 70441, 694381, 694381, 20946853, 20946853, 656540805 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 11 X 11 example

.1.1.0.1.1.0.1.1.0.1.1

.0.1.0.1.0.0.0.1.0.1.0

.1.1.0.1.1.0.1.1.0.1.1

.1.0.0.0.1.0.1.0.0.0.1

.1.1.0.1.1.0.1.1.0.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.0.1.1.0.1.1.0.1.1

.1.0.0.0.1.0.1.0.0.0.1

.1.1.0.1.1.0.1.1.0.1.1

.0.1.0.1.0.0.0.1.0.1.0

.1.1.0.1.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A323522 A040601 A022359 * A147507 A146865 A146740

Adjacent sequences:  A147488 A147489 A147490 * A147492 A147493 A147494

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified July 24 14:51 EDT 2021. Contains 346273 sequences. (Running on oeis4.)