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A162037 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 3 ones in any row 0
2, 5, 17, 69, 309, 1668, 10056, 66792, 487097, 3831282, 32364784, 291650388, 2787435921, 28151860269, 299220983205, 3336621374511, 38927257377509 (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: A101971 A211387 A303952 * A319467 A183239 A263639

Adjacent sequences:  A162034 A162035 A162036 * A162038 A162039 A162040

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 25 2009

STATUS

approved

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Last modified August 21 19:04 EDT 2019. Contains 326168 sequences. (Running on oeis4.)