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A146632 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 15, 45, 69, 191, 523, 2197, 7857, 44519, 172481, 1142709, 5725361, 46827941, 294096301, 2934334465, 22633368087 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.1.0

.1.1.0.1.1.1.1.0

.0.1.0.0.1.0.0.0

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.0.0.0.1.0.0.1.0

.0.1.1.1.1.0.1.1

.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A295179 A274020 A109952 * A076103 A094283 A158875

Adjacent sequences:  A146629 A146630 A146631 * A146633 A146634 A146635

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 28 03:20 EST 2022. Contains 350654 sequences. (Running on oeis4.)