A147427 - OEIS

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A147427

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 5, 13, 25, 49, 161, 793, 4845, 27471, 158415, 1126745, 9283892

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.1.1.1.1

.1.0.0.1.0.1.0.1

.1.1.0.0.0.0.0.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.0.0.0.0.0.1.1

.1.0.1.0.1.0.0.1

.1.1.1.1.1.0.1.1

CROSSREFS

Sequence in context: A147265 A272705 A147272 * A147408 A241657 A249513

Adjacent sequences: A147424 A147425 A147426 * A147428 A147429 A147430

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved