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!)
A006437 Number of tree-rooted toroidal maps with 3 faces and n vertices and without isthmuses.
(Formerly M5342)
1
70, 2330, 32130, 271285, 1655800, 7997850, 32332170, 113568455, 355905030 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..9.

T. R. S. Walsh and A. B. Lehman, Counting rooted maps by genus. III: Nonseparable maps, J. Combinatorial Theory Ser. B 18 (1975), 222-259.

CROSSREFS

Cf. A006436.

Sequence in context: A093757 A163022 A271031 * A067643 A285170 A017786

Adjacent sequences:  A006434 A006435 A006436 * A006438 A006439 A006440

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

Name clarified by Andrew Howroyd, Apr 04 2021

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 August 9 15:33 EDT 2022. Contains 356026 sequences. (Running on oeis4.)