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A146286 Number of n X n binary arrays symmetric 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, 5, 13, 29, 41, 99, 219, 653, 1719, 7125, 30115, 144385, 515791, 2502679, 10851481, 66672841, 362202203, 2693814149, 19415112859, 179313023913, 1385523385051 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.0.1.0.1.1.0.0

.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.1

.0.1.1.1.0.1.1.1

.0.0.1.1.0.1.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A159351 A163251 A247177 * A065374 A130066 A206258

Adjacent sequences:  A146283 A146284 A146285 * A146287 A146288 A146289

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified February 29 03:04 EST 2020. Contains 332353 sequences. (Running on oeis4.)