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A351157 Number of symmetric 0-1 matrices with zero main diagonal where rows are sorted lexicographically and row sums are nondecreasing. 2

%I

%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

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Last modified February 5 12:47 EST 2023. Contains 360084 sequences. (Running on oeis4.)