A361411 Number of cubic graphs on 2n unlabeled vertices rooted at a pair of indistinguishable vertices.

0, 1, 5, 33, 257, 2443, 27682, 363759, 5405697, 89134360, 1609418390, 31525697245, 665263778962, 15039817276939, 362579178545598, 9284375250749758, 251643492565059981, 7197256536139662143, 216621907269166632361, 6844093745422473471562

Offset

1,3

Links

Table of n, a(n) for n=1..20.

Crossrefs

Column k=2 of A361361.

Cf. A005638, A361408, A361410.

Sequence in context: A225612 A330802 A199552 * A061253 A111530 A367946

Adjacent sequences: A361408 A361409 A361410 * A361412 A361413 A361414

Keyword

nonn

Author

Andrew Howroyd, Mar 11 2023

Status

approved