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%I #12 May 04 2018 04:48:21
%S 0,2,6,28,148,1144,13128,250240,8295664,494367376,53628829952,
%T 10655018252544,3893626388008448,2627758027841688960,
%U 3289042848785452985600,7666804477507744021487616,33416397343695235205887366144,273365202164844511328577434284160
%N Birooted graphs: number of unlabeled graphs with n nodes rooted at 2 indistinguishable roots.
%F a(n) = 2 * A126122(n). - _Alois P. Heinz_, May 01 2018
%Y Cf. A303831 (connected), A303833 (trees), A126122.
%K nonn
%O 1,2
%A _Brendan McKay_, May 01 2018
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