A146218 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 10, 5, 44, 17, 490, 45, 4847, 317, 94850, 5736, 2753328, 99087, 124970926, 2137142, 7708832169, 81606063, 748069343112, 5341611544, 110489144610789, 471313494449

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 8 X 8 example
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1

Crossrefs

Sequence in context: A183132 A141321 A146266 * A033962 A241360 A096898

Adjacent sequences: A146215 A146216 A146217 * A146219 A146220 A146221

Keyword

nonn

Author

R. H. Hardin

Status

approved