login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A225823 Number of hopping sequences in four-colored rooted trees with n nodes, starting and ending with the same "initial state" from all of the (two-colored) rooted trees in A198760. Compared to A198761, only one node color of the initial states is mobile on the tree (Falicov-Kimball model). 3
1, 4, 54, 1568, 80680, 6510624, 761286848, 121944722176, 25668462562560 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

G. Gruber, Entwicklung einer graphbasierten Methode zur Analyse von Hüpfsequenzen auf Butcherbäumen und deren Implementierung in Haskell, Diploma thesis, Marburg, 2011

M. Paech, E. Kalinowski, W. Apel, G. Gruber, R. Loogen, and E. Jeckelmann, Ground-state energy and beyond: High-accuracy results for the Hubbard model on the Bethe lattice in the strong-coupling limit, DPG Spring Meeting, Berlin, TT 45.91 (2012)

LINKS

Table of n, a(n) for n=2..10.

Eva Kalinowski and Władysław Gluza, Evaluation of High Order Terms for the Hubbard Model in the Strong-Coupling Limit arXiv:1106.4938, 2011 (Physical Review B, January 2012)

Martin Paech, Numerische und algebraisch-graphentheoretische Algorithmen für korrelierte Quantensysteme, Dissertation, Hannover, 2015 (in German with an abstract in English).

CROSSREFS

Cf. A000081, A038055, A136793, A198760, A198761.

Sequence in context: A216733 A203039 A201731 * A265004 A284747 A003955

Adjacent sequences:  A225820 A225821 A225822 * A225824 A225825 A225826

KEYWORD

nonn,more

AUTHOR

Eva Kalinowski, Jul 30 2013

EXTENSIONS

Term a(10) added by Martin Paech, Sep 02 2013, calculated on a HP Integrity Superdome 2-32s by courtesy of Hewlett-Packard Development Company, L.P.

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 12 09:36 EST 2019. Contains 329953 sequences. (Running on oeis4.)