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A146686
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 63, 167, 435, 1337, 5021, 19355, 85901, 388093, 1971221, 10932161
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.1.0
.0.0.0.1.0.0.0.1
.0.0.0.1.1.0.0.1
.1.1.1.0.0.1.0.1
.1.0.1.0.0.1.1.1
.1.0.0.1.1.0.0.0
.1.0.0.0.1.0.0.0
.0.1.1.1.1.0.0.0
CROSSREFS
Sequence in context: A325920 A351754 A174743 * A309172 A178459 A129984
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved