A361409 Number of bicolored cubic graphs on 2n unlabeled vertices with n vertices of each color.

1, 0, 1, 5, 66, 1071, 27606, 887305, 34583357, 1562797351, 80177945542, 4597212665432, 291214532031215, 20193430937073303, 1521240318892230748, 123711268485285686123, 10801367759750192440520, 1007762402877770768660697, 100058924666668698411972015, 10533938778032068908299390227, 1172080056205294525370971027435

Offset

0,4

Comments

Adjacent vertices may have the same color.

Links

Table of n, a(n) for n=0..20.

Crossrefs

Central coefficients of A361361.

Cf. A005638, A361406, A361410, A361411.

Sequence in context: A219678 A297743 A279463 * A367837 A331721 A367847

Adjacent sequences: A361406 A361407 A361408 * A361410 A361411 A361412

Keyword

nonn

Author

Andrew Howroyd, Mar 11 2023

Status

approved