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A158609
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Expansion of (1+8*x)/(1-x-81*x^2).
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2
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1, 9, 90, 819, 8109, 74448, 731277, 6761565, 65995002, 613681767, 5959276929, 55667500056, 538368931305, 5047436435841, 48655319871546, 457497671174667, 4398578580769893, 41455889945917920, 397740754988279253
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OFFSET
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0,2
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REFERENCES
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H. S. M. Coxeter, Regular Polytopes, 3rd ed., Dover, NY, 1973, page 221.
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LINKS
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FORMULA
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MATHEMATICA
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M = {{0, t}, {t, 1/t}};
v[0] = {1, 1};
v[n_] := v[n] = M.v[n - 1];
t = 3;
a = Table[t^n*v[n][[1]], {n, 0, 30}]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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