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A333894 Number of unlabeled loopless multigraphs with n nodes of degree 3 or less. 1
1, 1, 4, 8, 26, 60, 184, 488, 1509, 4468, 14494, 47228, 163584, 580489, 2155219, 8245929, 32708045, 133615420, 562518913, 2432472970, 10794454457, 49060744260, 228113422904, 1083584062308, 5253168117841, 25964917671574, 130732997627332, 669989546176410, 3492408687398352 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..28.

FORMULA

Euler transform of A243391.

CROSSREFS

Column k=3 of A333893.

Cf. A243391.

Sequence in context: A074188 A126733 A297695 * A218079 A012982 A012952

Adjacent sequences:  A333891 A333892 A333893 * A333895 A333896 A333897

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Apr 08 2020

STATUS

approved

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Last modified December 5 15:06 EST 2021. Contains 349557 sequences. (Running on oeis4.)