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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. 0
1, 1, 1, 1, 1, 1, 105, 241, 1729, 3313, 39657, 104401, 2969697, 9697625, 3123603217, 14435373673, 2122314213377, 11094314340193, 1937878683810145, 12836441729414657, 6546745088072698929, 53161394239931798437 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)