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A147472 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 9, 9, 19, 19, 55, 55, 245, 245, 1021, 1021, 4107, 4107, 20679, 20679 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A062130 A151970 A049644 * A146914 A146253 A147040

Adjacent sequences:  A147469 A147470 A147471 * A147473 A147474 A147475

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified August 18 21:45 EDT 2022. Contains 356215 sequences. (Running on oeis4.)