A147339 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 11, 15, 183, 305, 1851, 3761, 35145, 75363, 1670651, 4265463, 180681913, 541465905, 30900571055, 107421245147, 8457236647761, 34044967457309, 4310491231691799

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.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
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0

Crossrefs

Sequence in context: A217085 A267123 A115779 * A147377 A147333 A097156

Adjacent sequences: A147336 A147337 A147338 * A147340 A147341 A147342

Keyword

nonn

Author

R. H. Hardin

Status

approved