A146266 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 10, 5, 44, 17, 490, 45, 3832, 281, 72349, 4672, 1945156, 78267, 77811492, 1571678, 4162726786, 52679419, 355835905036, 3071977536, 44996289731531, 240721783237

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A361671 A183132 A141321 * A146218 A033962 A241360

Adjacent sequences: A146263 A146264 A146265 * A146267 A146268 A146269

Keyword

nonn

Author

R. H. Hardin

Status

approved