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A162058
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 3 ones in any row or column
0
2, 6, 18, 77, 363, 2049, 12734, 88165, 657807, 5333430, 46068228, 424836442, 4143278352, 42649790768, 461486812345, 5232359427722, 62011437997666
OFFSET
1,1
CROSSREFS
Sequence in context: A007116 A280763 A079391 * A113844 A266858 A141580
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved