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Search: id:A162057
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A162057 Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 2 ones in any row or column +0
1
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; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A098407 A151390 A116426 this_sequence A026550 A124124 A052450

Adjacent sequences: A162054 A162055 A162056 this_sequence A162058 A162059 A162060

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jun 25 2009

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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