A000843 Number of quartic bicolored graphs on n unlabeled nodes admitting an automorphism exchanging the colors.

0, 0, 0, 1, 1, 4, 12, 66, 433, 3442, 30404, 294951, 3093770, 34846185, 419020738, 5355289843, 72466668921, 1034818990771, 15548633703424, 245182764121059, 4047990858838185, 69826392559499108, 1256005988628521464, 23517396850332614602, 457623646061902648705

Offset: 1

Author

Brendan McKay and Eric Rogoyski

Keywords

• nonn

Crossrefs

Column k=4 of A333159.

Cf. A000513, A000840.

Extensions

a(11)-a(25) from Andrew Howroyd, Mar 10 2020