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A147379
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 7, 15, 33, 101, 381, 1709, 8457, 46629, 303839, 2310935, 20572541, 212895819, 2545278493, 35199007061
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0
.0.1.1.0.0.1.1.1
.0.0.1.0.0.0.0.1
.0.0.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A351660 A199882 A147102 * A213722 A325924 A217092
KEYWORD
nonn
AUTHOR
STATUS
approved