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A146236 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 9, 17, 33, 89, 333, 849, 5379, 20923, 147329, 704405, 5858399, 36340527, 403495741, 3132269377, 47135996775, 474369570793, 8861603100211, 114644138972971 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.0.0.1.1.0.0

.0.0.0.1.1.0.1.1

.0.0.1.0.0.1.1.1

.1.1.1.0.0.1.0.0

.1.1.0.1.1.0.0.0

.0.0.1.1.0.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A127193 A262453 A197344 * A147279 A173788 A097478

Adjacent sequences:  A146233 A146234 A146235 * A146237 A146238 A146239

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)