A146178 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-100-111 pattern in any orientation.

1, 1, 1, 1, 5, 29, 161, 905, 3749, 24539, 286931, 3046339, 51706885, 1159037433, 32728917231, 966827028811

Offset

1,5

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.1.1.1.0
.1.1.1.0.1.0.1.0
.1.0.1.0.1.0.0.1
.1.0.0.1.0.1.0.1
.0.1.0.1.0.1.1.1
.0.1.1.1.0.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A098780 A222700 A272940 * A272751 A015537 A182017

Adjacent sequences: A146175 A146176 A146177 * A146179 A146180 A146181

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved