A333895 Number of unlabeled loopless multigraphs with n nodes of degree 4 or less.

1, 1, 5, 14, 61, 243, 1228, 6684, 42681, 304569, 2445296, 21676143, 210409238, 2213794888, 25064493886, 303468325469, 3909518220091, 53364222428953, 769009695515272, 11663042823897054, 185651491398956596, 3094082786005252494, 53871873427160960819

Offset

0,3

Links

Table of n, a(n) for n=0..22.

Formula

Euler transform of A289157.

Crossrefs

Column k=4 of A333893.

Cf. A289157.

Sequence in context: A279511 A281698 A362395 * A268814 A165517 A197788

Adjacent sequences: A333892 A333893 A333894 * A333896 A333897 A333898

Keyword

nonn

Author

Andrew Howroyd, Apr 08 2020

Status

approved