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A289157 Number of unlabeled connected loopless multigraphs with n nodes of degree 4 or less. 6
1, 1, 4, 9, 37, 146, 772, 4449, 30307, 228605, 1921464, 17652327, 176162548, 1893738334, 21806975279, 267636988052, 3486370839295, 48029272657002, 697542580286159, 10649954607360119, 170508064788069346, 2856122791685125616, 49951625299057923405 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
PROG
(nauty/bash) geng -c -D4 ${n} -q | multig -D4 -u
CROSSREFS
Column k=4 of A334546.
Cf. A121941 (single edges only), A134818 (with no more than triple edges), A289158 (with no more than double edges).
Cf. A243391 (degree 3 or less).
Sequence in context: A066924 A251689 A249101 * A149146 A149147 A149148
KEYWORD
nonn
AUTHOR
Natan Arie Consigli, Jul 04 2017
EXTENSIONS
a(18)-a(22) from Andrew Howroyd, Mar 20 2020
STATUS
approved

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Last modified April 25 10:34 EDT 2024. Contains 371967 sequences. (Running on oeis4.)