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A146193 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 85, 85, 561, 561, 4911, 4911, 35269, 35269 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.0.1.0.1.0.1.0.0

.0.0.1.1.1.0.1.1.1.0.0

.1.1.0.0.1.0.1.0.0.1.1

.0.1.0.0.0.0.0.0.0.1.0

.1.1.1.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0.1.1.1

.0.1.0.0.0.0.0.0.0.1.0

.1.1.0.0.1.0.1.0.0.1.1

.0.0.1.1.1.0.1.1.1.0.0

.0.0.1.0.1.0.1.0.1.0.0

CROSSREFS

Sequence in context: A146176 A147136 A146844 * A146727 A146426 A146051

Adjacent sequences:  A146190 A146191 A146192 * A146194 A146195 A146196

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified January 27 23:41 EST 2022. Contains 350654 sequences. (Running on oeis4.)