Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #20 Mar 11 2020 18:00:12
%S 0,0,0,1,1,4,12,66,433,3442,30404,294951,3093770,34846185,419020738,
%T 5355289843,72466668921,1034818990771,15548633703424,245182764121059,
%U 4047990858838185,69826392559499108,1256005988628521464,23517396850332614602,457623646061902648705
%N Number of quartic bicolored graphs on n unlabeled nodes admitting an automorphism exchanging the colors.
%Y Column k=4 of A333159.
%Y Cf. A000513, A000840.
%K nonn
%O 1,6
%A _Brendan McKay_ and Eric Rogoyski
%E a(11)-a(25) from _Andrew Howroyd_, Mar 10 2020