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A146220 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 2, 5, 10, 17, 34, 85, 281, 955, 3256, 11436, 47842, 229549, 1285142, 7367162, 46939349, 319959201, 2574706386, 22549841306, 223885431121, 2344970886285, 27997518161136, 360114867911637, 5365975270644628 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.1.0.0

.0.0.0.1.1.1.0.0

.0.0.0.0.1.0.1.1

.1.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.1

.1.1.0.1.0.0.0.0

.0.0.1.1.1.0.0.0

.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A227363 A262406 A018315 * A054964 A057752 A173057

Adjacent sequences:  A146217 A146218 A146219 * A146221 A146222 A146223

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 22 08:47 EST 2018. Contains 298042 sequences.