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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Sequence in context: A007116 A280763 A079391 * A113844 A266858 A141580

Adjacent sequences:  A162055 A162056 A162057 * A162059 A162060 A162061

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 25 2009

STATUS

approved

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Last modified February 25 08:33 EST 2021. Contains 341606 sequences. (Running on oeis4.)