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A146915 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 11, 13, 27, 33, 133, 219, 963, 1827, 9211, 19753, 116805, 296331, 2039489, 6042741, 48834357, 168628779, 1599274085, 6457217399, 71498858193, 337187982951, 4361666808175, 24042764787909 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.1.0.0

.0.1.0.0.0.1.1.1.0

.1.1.1.0.1.1.1.0.0

.0.1.1.1.0.1.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.0.1.0.1.1.1.0

.0.0.1.1.1.0.1.1.1

.0.1.1.1.0.0.0.1.0

.0.0.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A022325 A295340 A153055 * A067786 A132245 A140567

Adjacent sequences:  A146912 A146913 A146914 * A146916 A146917 A146918

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 7 11:05 EDT 2020. Contains 333301 sequences. (Running on oeis4.)