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A177467 (1+2*x+3*x^2)/(1-3*x-14*x^2+15*x^3+7*x^4) 0
1, 5, 32, 151, 819, 4056, 21145, 106877, 550088, 2800975, 14352987, 73273152, 374896033, 1915610597, 9795808064, 50069619991, 255991741683, 1308603509784, 6690079956601, 34200325541597 (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+2*x+3*x^2)/(1-3*x-14*x^2+15*x^3+7*x^4)

CROSSREFS

Sequence in context: A273623 A001589 A271903 * A268153 A271153 A272540

Adjacent sequences:  A177464 A177465 A177466 * A177468 A177469 A177470

KEYWORD

nonn

AUTHOR

Signy Olafsdottir (signy06(AT)ru.is), May 09 2010

STATUS

approved

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Last modified October 17 06:08 EDT 2019. Contains 328106 sequences. (Running on oeis4.)