A146265 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-110 pattern in any orientation.

1, 1, 3, 1, 7, 1, 104, 73, 2290, 889, 152134, 23481, 12486576, 1748579, 3428631159, 537394622, 1970919353906, 210642575089, 2518403936450056, 171343684579928, 6431595589741779276, 356508319334901141, 39444600664282424525228

Offset

1,3

Links

Table of n, a(n) for n=1..23.

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
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A331884 A146430 A146281 * A146217 A146007 A061782

Adjacent sequences: A146262 A146263 A146264 * A146266 A146267 A146268

Keyword

nonn

Author

R. H. Hardin

Status

approved