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A146859
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 5, 15, 25, 43, 109, 409, 1219, 6135, 18923, 91055, 376333, 2366771, 12618279, 101741365
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.1.1.0.0
.0.0.1.1.1.0.0.0
.1.1.0.0.1.0.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.0.0.1.0.0.1.1
.0.0.0.1.1.1.0.0
.0.0.1.1.0.1.0.0
CROSSREFS
Sequence in context: A018404 A053928 A146779 * A146835 A146795 A166479
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved