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Search: id:A107786
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| A107786 |
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Sequence obtained using characteristic polynomial that is Laplace transform of the minimal Pisot characteristic polynomial: -s^4*L(t^3-t-1)=s^3+s^2-6. |
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+0
1
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| 0, 1, 1, 1, 7, 1, 5, 47, 53, 23, 259, 577, 715, 839, 4301, 8591, 3557, 22249, 73795, 95137, 38357, 481127, 1051949, 821807, 2064955, 8376649, 13307491, 917761, 49342133, 129187079, 134693645, 161359153, 936481627, 1744643497, 776488579
(list; graph; listen)
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OFFSET
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0,5
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FORMULA
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two methods given ( first): a(n) = -a(n-1)+6*a(n-3)
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MATHEMATICA
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(*first method*) F[1] = 0; F[2] = 1; F[3] = 1; F[n__] := F[n] = -F[n - 1] + 6*F[n - 3] a = Table[Abs[F[n]], {n, 1, 50}] (*second method*) M = {{0, 1, 0}, {0, 0, 1}, {6, 0, -1}} v[1] = {0, 1, 1} v[n_] := v[n] = M.v[n - 1] a = Table[Abs[v[n][[1]]], {n, 1, 50}] Det[M - x*IdentityMatrix[3]]
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CROSSREFS
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Cf. A000045, A000213, A000931.
Sequence in context: A047875 A064467 A089204 this_sequence A154932 A026497 A010146
Adjacent sequences: A107783 A107784 A107785 this_sequence A107787 A107788 A107789
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 11 2005
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