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A177140 (1+4*x-x^2-2*x^3)/(1-3*x-14*x^2+15*x^3+7*x^4) 0
1, 7, 34, 183, 913, 4742, 24025, 123487, 629290, 3223119, 16458937, 84196718, 4302634, 2200098535, 11245820674, 57495512631, 293914705105, 1502593292294, 7681432314169, 39269413869631 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

S. Kitaev, A. Burstein and T. Mansour. Counting independent sets in certain classes of (almost) regular graphs, Pure Mathematics and Applications (PU.M.A.) 19 (2008), no. 2-3, 17-26.

LINKS

Table of n, a(n) for n=1..20.

S. Kitaev, A. Burstein and T. Mansour. Counting independent sets in certain classes of (almost) regular graphs

FORMULA

(1+4*x-x^2-2*x^3)/(1-3*x-14*x^2+15*x^3+7*x^4)

CROSSREFS

Sequence in context: A027209 A209807 A080048 * A027233 A117650 A144038

Adjacent sequences:  A177137 A177138 A177139 * A177141 A177142 A177143

KEYWORD

nonn

AUTHOR

Signy Olafsdottir (signy06(AT)ru.is), May 03 2010

STATUS

approved

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Last modified May 23 16:37 EDT 2013. Contains 225610 sequences.