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%I #6 Apr 21 2021 13:06:52
%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 1's in any row.
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 25 2009