A147188 - OEIS

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A147188

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01110-00011 pattern in any orientation.

1, 1, 1, 1, 1, 3, 7, 15, 41, 163, 697, 3471, 20005, 143359, 1211791, 12104355, 142437683, 2011344929, 33622364965, 665157511111

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

OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.1.1.0.0.0

.0.0.1.0.1.1.1.0

.0.0.1.1.0.0.1.1

.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A216616 A230958 A146033 * A050565 A097111 A371914

Adjacent sequences: A147185 A147186 A147187 * A147189 A147190 A147191

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved