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A006825 Number of connected regular bipartite graphs of degree 5 with 2n nodes.
(Formerly M3679)
3
1, 1, 4, 41, 1981, 304495, 78322915, 27033154060, 11934777413004, 6593485023087880, 4485517185017428244, 3707462300996566329965, 3680029088808677189795063, 4341813441626419937873317841, 6033239205199247162872884404386, 9792722283774374706204648839780148 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,3
REFERENCES
CRC Handbook of Combinatorial Designs, 1996, p. 648.
I. A. Faradzev, Constructive enumeration of combinatorial objects, pp. 131-135 of Problèmes combinatoires et théorie des graphes (Orsay, 9-13 Juillet 1976). Colloq. Internat. du C.N.R.S., No. 260, Centre Nat. Recherche Scient., Paris, 1978.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
B. D. McKay and E. Rogoyski, Latin squares of order ten, Electron. J. Combinatorics, 2 (1995) #N3.
FORMULA
Inverse Euler transform of A333731. - Andrew Howroyd, Apr 03 2020
CROSSREFS
Column 5 of A008326.
Sequence in context: A022515 A172496 A059730 * A333731 A326899 A022500
KEYWORD
nonn,hard
AUTHOR
EXTENSIONS
More terms from Eric Rogoyski, May 15 1997
Terms a(12) and beyond from Andrew Howroyd, Apr 03 2020
STATUS
approved

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Last modified July 20 05:30 EDT 2024. Contains 374441 sequences. (Running on oeis4.)