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A146474 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 85, 85, 375, 375, 2149, 2149, 15299, 15299, 129877, 129877, 1353943, 1353943, 17475557, 17475557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.1.0.0.0.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.1.1.1.0.1.0.1.0.1.1.1

.0.1.1.1.0.0.0.1.1.1.0

.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.1.0.0.0.1.1.1.0

.1.1.1.0.1.0.1.0.1.1.1

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A146663 A146394 A147510 * A145957 A214439 A128019

Adjacent sequences:  A146471 A146472 A146473 * A146475 A146476 A146477

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 26 02:39 EST 2022. Contains 350572 sequences. (Running on oeis4.)