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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 3 ones in any row
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%I #4 Dec 18 2015 18:17:22

%S 2,3,9,41,205,1190,7529,51751,387737,3113542,26765060,244702054,

%T 2367701249,24169612036,259289525510,2915165124175,34258966408875

%N Number of n X n symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 3 ones in any row

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009