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A162116
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 8 ones in any row or column
0
2, 4, 9, 56, 499, 8000, 207554, 9382078, 723818669, 93919689474, 19191447316594, 5833792312541241
OFFSET
1,1
CROSSREFS
Sequence in context: A162113 A162114 A162115 * A162117 A162109 A271553
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved