login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A006389 Number of unsensed planar maps with n edges and without faces of degree 1.
(Formerly M1632)
0
1, 2, 6, 18, 68, 313, 1592, 9187, 57451, 384450, 2703970, 19769311 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Timothy R. Walsh, Generating nonisomorphic maps without storing them, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.
CROSSREFS
Cf. A006385.
Sequence in context: A150080 A150081 A006674 * A030269 A150082 A177470
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(8)-a(12) from Sean A. Irvine, Mar 28 2017
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 13 02:05 EDT 2024. Contains 371639 sequences. (Running on oeis4.)