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%I #21 Jun 06 2026 09:36:18
%S 1,2,7,38,291,2992,39901,671988,13985425,353688776,10727351559,
%T 386191457368,16366605016867,811040276304000,46734031886035981,
%U 3116545769980638608,239533244153400701889,21139777447997406826528,2135037083985117552780775,245988447923037280128476256,32236496766580157482357925251,4791790309982290679028884264192,805792482027968205444481861258077,152912453731357918254230140975508800,32668668173514056690764998868299488401
%N Number of labeled squarefree bipartite graphs on n vertices.
%C The counts include bipartite graphs with no cycles at as well as of those of girth at least 6.
%Y The unlabeled counts are A138347.
%K hard,nonn
%O 1,2
%A _Brendan McKay_, Jun 06 2026