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A147439
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-1010 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 9, 19, 46, 175, 744, 3837, 22276, 149923, 1180818, 11235559
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.0.0.0.0.1.1.1.1
.0.0.0.0.1.0.1.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A147463 A095828 A028377 * A091411 A279682 A102001
KEYWORD
nonn
AUTHOR
STATUS
approved