A333731 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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