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A146472 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 3, 9, 23, 85, 375, 2149, 15299, 129877, 1353943, 17475557, 279267939, 5511590965, 133957241929, 4003924495735, 147542199515841, 6704016396279819, 375798793326385295, 25965634034447375655 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.0.0.0.0

.1.0.1.1.1.0.0.0

.1.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.0.0.0.1.1.1.0.1

.0.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A146392 A116659 A147508 * A145955 A129834 A029488

Adjacent sequences:  A146469 A146470 A146471 * A146473 A146474 A146475

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 2 16:17 EST 2021. Contains 349445 sequences. (Running on oeis4.)