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A146184
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 87, 301, 1337, 5927, 24359, 118543, 715115, 5164241, 42357883, 353625469, 3347092839, 36905312969, 482588953149, 7069762004523, 114903134718451
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.1.1.1.0.0.0
.0.1.0.1.1.0.0.0
.0.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.0
.0.0.0.1.1.0.1.0
.0.0.0.1.1.1.0.0
.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A146401 A146465 A147119 * A155274 A058058 A348308
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved