A147118 - OEIS

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A147118

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 3, 11, 27, 63, 285, 1745, 11867, 83339, 729439, 8174347, 113015753, 1872094927, 37173405545, 899575608439, 26450719284143

(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

.0.0.0.0.0.0.0.1

.0.0.0.0.1.1.1.1

.0.0.0.1.0.0.1.0

.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A147173 A147110 A372612 * A147157 A146826 A059400

Adjacent sequences: A147115 A147116 A147117 * A147119 A147120 A147121

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved