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!)
A006397 Number of unsensed planar maps with n edges and without faces or vertices of degree 1.
(Formerly M1236)
0
1, 2, 4, 10, 34, 114, 475, 2104, 10177, 52012, 279874 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
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
Sequence in context: A323207 A327424 A220028 * A297197 A297201 A003422
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(9)-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 15 15:27 EDT 2024. Contains 371692 sequences. (Running on oeis4.)