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A162036 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 2 ones in any row 1
2, 5, 12, 28, 71, 186, 507, 1443, 4241, 12895, 40333, 129679, 427455, 1442384, 4975291, 17518890, 62907021, 230104503, 856679290, 3243467627, 12479244341, 48759284806, 193353224018, 777721210211 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

CROSSREFS

Sequence in context: A024960 A291234 A238828 * A321253 A290073 A232534

Adjacent sequences:  A162033 A162034 A162035 * A162037 A162038 A162039

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 25 2009

STATUS

approved

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Last modified July 21 22:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)