A146178 - OEIS

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A146178

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-100-111 pattern in any orientation.

1, 1, 1, 1, 5, 29, 161, 905, 3749, 24539, 286931, 3046339, 51706885, 1159037433, 32728917231, 966827028811

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.1.1.1.0

.1.1.1.0.1.0.1.0

.1.0.1.0.1.0.0.1

.1.0.0.1.0.1.0.1

.0.1.0.1.0.1.1.1

.0.1.1.1.0.0.0.0

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A098780 A222700 A272940 * A272751 A015537 A182017

Adjacent sequences: A146175 A146176 A146177 * A146179 A146180 A146181

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved