A146190 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 89, 89, 973, 973, 38577, 38577, 1078541, 1078541, 28644797, 28644797, 2049754535, 2049754535, 324959092887, 324959092887

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A147029 A146258 A146173 * A147125 A147109 A147117

Adjacent sequences: A146187 A146188 A146189 * A146191 A146192 A146193

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved