A000843 - 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