A146279 - OEIS

A146279

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation.

1, 1, 1, 1, 3, 13, 51, 211, 749, 2651, 19761, 133713, 1247055, 13243557, 208954265, 3004516121, 57775455787, 1089272926485, 30671906403639, 864548428805023

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OFFSET

1,5

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1

.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A360874 A270913 A323266 * A098619 A086608 A291182

Adjacent sequences: A146276 A146277 A146278 * A146280 A146281 A146282

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved