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A146392
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0111 pattern in any orientation.
0
1, 1, 1, 1, 3, 9, 23, 77, 415, 2809, 21039, 202829, 2557861, 41110329, 812468577, 20241517719, 638623731453, 25413793552471
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.1
.0.0.0.0.0.1.1.0
.1.0.0.0.0.0.1.1
.1.0.0.1.0.0.0.1
.1.1.0.1.1.0.0.1
.0.1.1.0.1.1.1.0
CROSSREFS
Sequence in context: A196488 A108488 A018334 * A116659 A147508 A146472
KEYWORD
nonn
AUTHOR
STATUS
approved