A146616 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 19, 43, 79, 175, 645, 2171, 9657, 44753, 231501, 1238311, 7694793, 51485225, 407164775, 3411323191

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.1.1.0.1.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.1.0.1.1.0.1.1
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A094465 A020580 A172043 * A146395 A154302 A146736

Adjacent sequences: A146613 A146614 A146615 * A146617 A146618 A146619

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved