A147468 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 57, 101, 607, 1089, 8859, 19351, 240245, 590155, 24829301, 73370321, 4764846299, 16592732065, 1205158717385, 4890998445663, 529813293025221, 2499121025302115, 491892443613075873

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.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
.0.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
.1.1.1.1.0.1.1.1.1
.1.1.0.0.0.0.0.1.1

Crossrefs

Sequence in context: A200932 A145554 A111320 * A147036 A147044 A366206

Adjacent sequences: A147465 A147466 A147467 * A147469 A147470 A147471

Keyword

nonn

Author

R. H. Hardin

Status

approved