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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 4 ones in any row.
0

%I #6 Jan 01 2024 18:34:51

%S 2,3,9,48,397,4046,50562,725875,11870670,219522591,4530707851,

%T 103448006539,2595528068368,71042542549939

%N Number of n X n symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 4 ones in any row.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jun 25 2009