A146430 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-101 pattern in any orientation.

1, 1, 3, 1, 7, 1, 37, 25, 437, 223, 16431, 2029, 527367, 30275, 25330876, 3302117, 3127296780, 405040667, 935559062214, 47290059763, 368226978458546, 9353389652113, 210092690735675833, 6107485984014353, 249527416442744315305

Offset

1,3

Links

Table of n, a(n) for n=1..25.

Example

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

Crossrefs

Sequence in context: A278954 A350802 A331884 * A146281 A146265 A146217

Adjacent sequences: A146427 A146428 A146429 * A146431 A146432 A146433

Keyword

nonn

Author

R. H. Hardin

Status

approved