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A146285 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 111-110-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 11, 5, 29, 13, 127, 25, 445, 59, 1927, 333, 10103, 1935, 78527, 9121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.1.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

.1.1.1.0.0.0.1.1.1

.1.1.0.0.0.0.0.1.1

.1.1.1.0.0.0.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A146935 A133730 A112031 * A146059 A046531 A289310

Adjacent sequences:  A146282 A146283 A146284 * A146286 A146287 A146288

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified April 19 06:30 EDT 2019. Contains 322237 sequences. (Running on oeis4.)