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A146448
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.
0
1, 1, 1, 1, 3, 7, 15, 49, 233, 1205, 7091, 56369, 554977, 6653663, 98474615, 1800719003, 40485995917, 1128941883627, 39031781085873, 1652786153476941
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.0.1.0.0
.1.0.1.1.0.1.1.0
.1.1.0.1.1.0.1.1
.0.1.1.0.0.1.0.1
.0.0.1.0.0.1.1.0
.1.1.0.1.1.0.1.1
.0.1.1.0.1.1.0.1
.0.0.1.1.0.1.1.0
CROSSREFS
Sequence in context: A151401 A080567 A276969 * A192169 A290470 A268061
KEYWORD
nonn
AUTHOR
STATUS
approved