A147410 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1001-1001-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 7, 5, 13, 13, 43, 25, 193, 49, 641, 175, 2061, 865

Offset

1,10

Links

Table of n, a(n) for n=1..25.

Example

Maximal 10 X 10 example
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.1.1.1.0.0.0
.1.1.1.0.0.0.0.1.1.1
.0.0.1.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.1.0.0
.1.1.1.0.0.0.0.1.1.1
.0.0.0.1.1.1.1.0.0.0
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.0.0.1.0.0.0

Crossrefs

Sequence in context: A254938 A244149 A378642 * A146623 A197943 A318828

Adjacent sequences: A147407 A147408 A147409 * A147411 A147412 A147413

Keyword

nonn

Author

R. H. Hardin

Status

approved