A380623 Number of rooted 5-regular combinatorial maps with 2n vertices.

1, 189, 869400, 16482741030, 811815704093520, 82428779884228798041, 14987637044586056537983800, 4438122232105976899960948809420, 1998996880327869592350459728071408800, 1300772228637464354810371940980750446850116, 1174611244368635468934806695142536970482225836000

Offset

0,2

Comments

There are no 5-regular combinatorial maps with an odd number of vertices.

Links

Andrew Howroyd, Table of n, a(n) for n = 0..100

Crossrefs

With interspersed zeros column 5 of A380622.

Sequence in context: A076012 A092136 A323320 * A352759 A259166 A156741

Adjacent sequences: A380620 A380621 A380622 * A380624 A380625 A380626

Keyword

nonn

Author

Andrew Howroyd, Jan 29 2025

Status

approved