%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