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A162057 Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 2 ones in any row or column 0
2, 6, 13, 34, 86, 233, 652, 1888, 5683, 17526, 55868, 182024, 609103, 2081152, 7268823, 25891230, 93983793, 347398900, 1306005890, 4991876362, 19377811110, 76372139937, 305348766558, 1238006401576, 5086973436072 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
CROSSREFS
Sequence in context: A151390 A116426 A196906 * A026550 A319751 A124124
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved

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Last modified May 26 22:41 EDT 2024. Contains 372847 sequences. (Running on oeis4.)