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A162114
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 6 ones in any row or column
0
2, 4, 9, 56, 499, 8000, 200367, 7707352, 406328329, 28320262170, 2490234078408, 267515727878427
OFFSET
1,1
CROSSREFS
Sequence in context: A241600 A162112 A162113 * A162115 A162116 A162117
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved