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!)
A006818 Trails of length n on hexagonal lattice.
(Formerly M4203)
1
1, 6, 30, 150, 738, 3570, 17118, 81498, 385710, 1817046, 8528478, 39903462, 186198642, 866861394, 4027766490, 18681900270, 86518735722, 400136695074, 1848320799438, 8528448008214 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
A. J. Guttmann, Lattice trails II: numerical results, J. Phys. A 22 (1989), 575-588.
CROSSREFS
Sequence in context: A075886 A001412 A162937 * A006819 A163317 A342807
KEYWORD
nonn,walk,more
AUTHOR
EXTENSIONS
a(17)-a(19) from Sean A. Irvine, Aug 15 2020
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 February 28 19:33 EST 2024. Contains 370400 sequences. (Running on oeis4.)