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A048180 Number of graphs with n nodes and n+2 edges. 4
1, 4, 24, 131, 663, 3252, 15772, 75415, 359307, 1711908, 8191607, 39500169, 192525021, 950868860, 4769060224, 24331970791, 126457607026, 670143402073, 3623530476832, 19998343352758, 112668088476243, 647904733883526 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,2
REFERENCES
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 146.
LINKS
M. L. Stein and P. R. Stein, Enumeration of Linear Graphs and Connected Linear Graphs up to p = 18 Points. Report LA-3775, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Oct 1967
CROSSREFS
Cf. A008406.
Sequence in context: A174443 A180222 A192070 * A057391 A071079 A153337
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Vladeta Jovovic, Jan 03 2000
More terms from Sean A. Irvine, Jun 07 2017
STATUS
approved

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Last modified July 15 12:56 EDT 2024. Contains 374332 sequences. (Running on oeis4.)