A303033 Number of unlabeled connected loopless multigraphs with n nodes of degree 5 or less and with single, double or triple edges.

1, 1, 3, 12, 81, 535, 5274, 60684, 869238, 14595645, 284939257, 6347472749, 159579271688, 4482770916274, 139578090353236, 4783834092385411, 179397242557917048, 7322223973235272082, 323760818899998259561, 15443359560966718348986, 791699492870169123493379

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Prog

(nauty/shell) for n in {1..11}; do geng -c -D5 ${n}  -q | multig  -m3 -D5 -u;

Crossrefs

Cf. A134818, A303030, A303031, A303032.

Sequence in context: A182166 A303047 A197445 * A207322 A188227 A357665

Adjacent sequences: A303030 A303031 A303032 * A303034 A303035 A303036

Keyword

nonn

Author

Natan Arie Consigli, Jun 04 2018

Extensions

a(12)-a(20) from Andrew Howroyd, Mar 20 2020

Status

approved