%I #5 Apr 06 2020 00:22:35
%S 1,2,5,30,230,4600,118735,8311450,756803538,190714491576,
%T 62835570762274,58060067384341176,70381397432713019444,
%U 241548955989071082731808,1090217292455289464608212443,14031096553899575409507694141410
%N Number of n X n symmetric binary matrices with no more than one greater count of 1's than 0's in and to the left of any position.
%K nonn
%O 0,2
%A _R. H. Hardin_, Jul 13 2008