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Number of n X n symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 2 ones in any row
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%I #4 Dec 18 2015 18:17:22

%S 2,3,7,16,41,109,298,858,2533,7773,24438,79079,261961,888335,3078307,

%T 10884541,39246121,144089532,538426333,2045444718,7895980672,

%U 30947906902,123093837504,496552331743,2030469580356

%N Number of n X n symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 2 ones in any row

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009