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

1,6

Links

Table of n, a(n) for n=1..25.

Crossrefs

Column k=4 of A333159.

Cf. A000513, A000840.

Sequence in context: A275527 A222612 A339134 * A369284 A385315 A358409

Adjacent sequences: A000840 A000841 A000842 * A000844 A000845 A000846

Keyword

nonn

Author

Brendan McKay and Eric Rogoyski

Extensions

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

Status

approved