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A053420 Number of 4-multigraphs on n nodes. 3
1, 5, 35, 900, 90005, 43571400, 95277592625, 925609100039625, 40119721052610123750, 7833164300852979350336250, 6953552738579427778531249187500, 28293472829338822230349054996265275000, 531350037528849507720092485196308155336875000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..50

Harald Fripertinger, The cycle type of the induced action on 2-subsets

Vladeta Jovovic, Formulae for the number T(n,k) of n-multigraphs on k nodes

CROSSREFS

Column k=4 of A063841.

Cf. A000088, A004102, A053400.

Sequence in context: A317816 A034236 A058015 * A321605 A001802 A122590

Adjacent sequences:  A053417 A053418 A053419 * A053421 A053422 A053423

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Jan 11 2000

EXTENSIONS

Terms a(12) and beyond from Andrew Howroyd, Oct 22 2017

STATUS

approved

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Last modified November 15 11:35 EST 2018. Contains 317238 sequences. (Running on oeis4.)