A146257 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 105, 241, 1729, 3313, 39657, 104401, 2969697, 9697625, 3123603217, 14435373673, 2122314213377, 11094314340193, 1937878683810145, 12836441729414657, 6546745088072698929, 53161394239931798437

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
.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
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A262723 A250757 A350199 * A075764 A046299 A010090

Adjacent sequences: A146254 A146255 A146256 * A146258 A146259 A146260

Keyword

nonn

Author

R. H. Hardin

Status

approved