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Number of symmetric 0-1 matrices with nondecreasing row sums.
2

%I #9 Feb 07 2022 17:10:39

%S 1,2,6,26,182,2170,45640,1728722,119663816,15307529470,3650708270236,

%T 1634796996516742,1382620288569817496

%N Number of symmetric 0-1 matrices with nondecreasing row sums.

%Y Cf. A016121, A351158, A351287.

%K nonn,more

%O 0,2

%A _Max Alekseyev_, Feb 06 2022

%E a(8)-a(12) from _Andrew Howroyd_, Feb 06 2022