A147469 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 39, 39, 155, 155, 1391, 1391, 19355, 19355, 265987, 265987, 4290113, 4290113, 107056079, 107056079

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A147167 A146647 A146719 * A146274 A147037 A146796

Adjacent sequences: A147466 A147467 A147468 * A147470 A147471 A147472

Keyword

nonn

Author

R. H. Hardin

Status

approved