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A147433 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 19, 19, 43, 43, 151, 151, 665, 665, 3477, 3477 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

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

EXAMPLE

Maximal 13 X 13 example

.0.0.1.0.1.0.0.0.1.0.1.0.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.1.1.0.1.0.1.0.1.0.1.0.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.1.1.0.0.0.0.0.0.0.0.0.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.1.1.0.0.0.0.0.0.0.0.0.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.1.1.0.1.0.1.0.1.0.1.0.1.1

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.0.1.0.1.0.0.0.1.0.1.0.0

CROSSREFS

Sequence in context: A086739 A147502 A147343 * A146903 A146607 A147072

Adjacent sequences: A147430 A147431 A147432 * A147434 A147435 A147436

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 7 10:26 EST 2022. Contains 358656 sequences. (Running on oeis4.)