A146246 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 11, 21, 35, 67, 259, 945, 3949, 14269, 69629, 358835, 2304465, 14395141, 109376391, 851675891, 8461569139, 84383219157, 1033770596811, 12613520889815, 192843929142189, 2993789320611135

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.0.1.1.1.0.0
.0.1.0.1.1.0.0.0
.1.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.1
.0.0.0.1.1.0.1.0
.0.0.1.1.1.0.0.0
.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A109335 A086982 A145060 * A215968 A064832 A129638

Adjacent sequences: A146243 A146244 A146245 * A146247 A146248 A146249

Keyword

nonn

Author

R. H. Hardin

Status

approved