OFFSET
0,2
REFERENCES
S. J. Cyvin and I. Gutman, Kekulé structures in benzenoid hydrocarbons, Lecture Notes in Chemistry, No. 46, Springer, New York, 1988 (see p. 243, M_n(LLAAAAL)).
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (8,-28,56,-70,56,-28,8,-1).
FORMULA
a(n) = (n+1)*(n+2)*(n+3)*(155*n^4 +911*n^3 +2062*n^2 +2122*n +840)/7!.
G.f.: (8*x^4+54*x^3+71*x^2+21*x+1)/(x-1)^8. - Alois P. Heinz, Feb 27 2015
MAPLE
a:=n->(n+1)*(n+2)*(n+3)*(155*n^4+911*n^3+2062*n^2+2122*n+840)/5040: seq(a(n), n=0..31);
MATHEMATICA
CoefficientList[Series[(8*x^4 + 54*x^3 + 71*x^2 + 21*x + 1)/(x - 1)^8, {x, 0, 50}], x] (* G. C. Greubel, Sep 06 2017 *)
PROG
(PARI) x='x+O('x^50); Vec((8*x^4+54*x^3+71*x^2+21*x+1)/(x-1)^8) \\ G. C. Greubel, Sep 06 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Emeric Deutsch, Aug 03 2005
STATUS
approved