A147459 - OEIS

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A147459

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11000-01111-11000 pattern in any orientation.

1, 1, 1, 1, 1, 9, 17, 31, 97, 415, 1502, 7931, 40536, 274361, 1932218, 18327587, 174386942

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.1.1.0.0.0

.0.1.0.0.1.1.1.1

.0.1.0.1.1.0.0.0

.1.1.1.0.0.1.0.1

.1.0.1.0.0.1.1.1

.0.0.0.1.1.0.1.0

.1.1.1.1.0.0.1.0

.0.0.0.1.1.0.1.0

CROSSREFS

Sequence in context: A081030 A285009 A228260 * A352789 A188559 A014004

Adjacent sequences: A147456 A147457 A147458 * A147460 A147461 A147462

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved