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A146018
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
0
1, 1, 1, 1, 3, 13, 41, 219, 1033, 8217, 92671, 1241193, 21102313, 438374597, 11919134635, 429471270295, 20089457592037, 1200700834920789, 91306423605321353, 8917989878582336861
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.0.0.1.0.0.1
.0.0.0.0.1.0.0.1
.0.0.0.0.1.1.0.1
.1.1.1.1.0.0.1.1
.0.0.0.1.0.0.0.0
.0.0.0.0.1.0.0.0
.0.1.1.1.1.0.0.0
CROSSREFS
Sequence in context: A234387 A173867 A121162 * A145946 A109224 A106050
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved