A146181 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 133, 283, 2411, 6513, 104581, 308359, 31267501, 125706815, 30388182025, 158816649115, 38510941635475, 255401019744941, 142458224930527429, 1198142574949310095, 2063515953281030710129

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A254692 A050882 A146233 * A105984 A115518 A064903

Adjacent sequences: A146178 A146179 A146180 * A146182 A146183 A146184

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved