%I

%S 2,5,12,28,71,186,507,1443,4241,12895,40333,129679,427455,1442384,

%T 4975291,17518890,62907021,230104503,856679290,3243467627,12479244341,

%U 48759284806,193353224018,777721210211

%N 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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009