A146996 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 7, 1, 28, 9, 229, 55, 5513, 1233, 246733, 35489, 18835539, 2205048, 2577591714, 236261747, 672360073942, 49798609885, 337403612881491, 18952604466995, 317710878094077132, 13788718527302227

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0

Crossrefs

Sequence in context: A053288 A282917 A050301 * A286895 A083994 A301731

Adjacent sequences: A146993 A146994 A146995 * A146997 A146998 A146999

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved