A147412 - OEIS

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A147412

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1001-1111 pattern in any orientation.

0

1, 1, 1, 1, 1, 5, 17, 41, 185, 633, 2157, 7997, 47735, 277209, 2208471, 17450513, 197122185, 2176282667, 31077679505

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.1.1.1.1

.1.0.0.0.1.0.0.1

.1.0.0.0.1.0.0.1

.1.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.1

.1.0.0.1.0.0.0.1

.1.0.0.1.0.0.0.1

.1.1.1.1.0.1.1.1

CROSSREFS

Sequence in context: A146794 A146834 A130739 * A273116 A273945 A111268

Adjacent sequences: A147409 A147410 A147411 * A147413 A147414 A147415

KEYWORD

nonn

AUTHOR

STATUS

approved