A146241 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 37, 73, 549, 1155, 18213, 46753, 1912543, 6241489, 625732277, 2571374751, 388840217669, 1994859107661, 608353553481999, 3912610945442677, 2428168209787780883, 19568752353921733413, 24097482751802550964553

Offset

1,7

Links

Table of n, a(n) for n=1..23.

Example

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

Crossrefs

Sequence in context: A137833 A083748 A146273 * A217386 A083990 A123815

Adjacent sequences: A146238 A146239 A146240 * A146242 A146243 A146244

Keyword

nonn

Author

R. H. Hardin

Status

approved