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A146130
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.
0
1, 1, 1, 1, 5, 17, 59, 325, 2193, 20593, 247017, 3816169, 76385445, 1998729963, 68606304143, 3070344768595, 178823377788539, 13583194771026533, 1345184891829774733
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.1.1.0.0.1.1
.0.1.0.1.1.1.0.0
.0.1.1.0.0.0.1.0
.1.0.1.0.0.0.1.0
.1.0.1.0.0.0.1.1
.1.1.0.1.1.1.0.1
.0.1.0.0.0.1.1.0
CROSSREFS
Sequence in context: A149659 A149660 A149661 * A026619 A142956 A273422
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved