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A361406
Number of bicolored connected cubic graphs on 2n unlabeled vertices with n vertices of each color.
2
1, 0, 1, 5, 63, 1052, 27336, 882321, 34455134, 1558650424, 80016369538, 4589908631503, 290839634055722, 20171917072658395, 1519875854413728667, 123616508830454828043, 10794216583730162449785, 1007179737486515827821590, 100007950522974604304016627, 10529173417583858651114779790, 1171605981584666223513790021758
OFFSET
0,4
COMMENTS
Adjacent vertices may have the same color.
EXAMPLE
a(1) = 1 since the only cubic graph on 4 vertices is the complete graph. The bicolored graphs are indistinguishable whichever 2 vertices are colored in the first color.
CROSSREFS
Central coefficients of A321304.
Sequence in context: A222376 A243218 A112788 * A355411 A334907 A218102
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Mar 11 2023
STATUS
approved