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A000840 Number of cubic bicolored graphs on n unlabeled nodes admitting an automorphism exchanging the colors. 4
0, 0, 1, 1, 2, 5, 12, 31, 90, 285, 938, 3285, 11983, 45390, 177803, 718390, 2986407, 12749364, 55802982, 250068732, 1145923828, 5363795830, 25620207380, 124767647097, 618983876918, 3126035142910, 16060182735947, 83883575376862, 445164927249466, 2399098651337048 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Column k=3 of A333159.

Cf. A000512, A000843, A004066, A008325.

Sequence in context: A045633 A090826 A132441 * A232215 A265265 A293868

Adjacent sequences:  A000837 A000838 A000839 * A000841 A000842 A000843

KEYWORD

nonn

AUTHOR

Brendan McKay and Eric Rogoyski

EXTENSIONS

a(11)-a(30) from Andrew Howroyd, Mar 10 2020

STATUS

approved

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Last modified February 26 07:51 EST 2021. Contains 341631 sequences. (Running on oeis4.)