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%I #12 Mar 11 2022 14:36:42
%S 1,2,4,11,33,145,839,7449
%N Number of symmetric 0-1 matrices with zero main diagonal where rows are sorted lexicographically and row sums are nondecreasing.
%Y Cf. A016121
%K nonn,hard,more
%O 1,2
%A _Max Alekseyev_, Feb 02 2022