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A147070
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11111-00001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 9, 19, 61, 211, 741, 3813, 22505, 147447, 1175399, 10583799, 109540847, 1364336983, 19785643957, 336137809321, 6744593577357, 157257981066897
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.0.0
.1.0.0.0.0.1.1.0
.1.1.1.1.1.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A297390 A018316 A146605 * A130586 A147146 A146066
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved