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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.
0
1, 1, 1, 1, 1, 3, 7, 15, 41, 163, 697, 3471, 20005, 143359, 1211791, 12104355, 142437683, 2011344929, 33622364965, 665157511111
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved