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.

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

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