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A162113
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 5 ones in any row or column
0
2, 4, 9, 56, 499, 7547, 153908, 4044965, 130514696, 5066256614, 230102555991, 12148280002838, 731530791483164
OFFSET
1,1
CROSSREFS
Sequence in context: A162111 A241600 A162112 * A162114 A162115 A162116
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved