A333731 Number of simple 5-regular bipartite graphs with 2n nodes.

0, 0, 0, 0, 1, 1, 4, 41, 1981, 304496, 78322916, 27033154065, 11934777413049, 6593485023089912, 4485517185017734885, 3707462300996644966161, 3680029088808704302571244, 4341813441626431900011624077, 6033239205199253768404631967656, 9792722283774379198364367866020815

Offset

1,7

Links

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

Formula

Euler transform of A006825.

Crossrefs

Column k=5 of A008327.

Sequence in context: A172496 A059730 A006825 * A326899 A022500 A320335

Adjacent sequences: A333728 A333729 A333730 * A333732 A333733 A333734

Keyword

nonn

Author

Andrew Howroyd, Apr 03 2020

Status

approved