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A115052
Expansion of 1/(3*x^2 - 3*x + 1)^2.
2
1, 6, 21, 54, 108, 162, 135, -162, -1053, -2916, -5832, -8748, -8019, 4374, 41553, 118098, 236196, 354294, 334611, -118098, -1476225, -4251528, -8503056, -12754584, -12223143, 3188646, 49424013, 143489070, 286978140
OFFSET
0,2
COMMENTS
q=1 coefficient expansion of hierarchical lattice renormalization polynomial.
REFERENCES
The Beauty of Fractals, Springer-Verlag, New York, 1986, editors Peitgen and Richter, p. 146
MAPLE
A115052 := proc(n) 1/(3*x^2-3*x+1)^2 ; coeftayl(%, x=0, n) ; end proc:# R. J. Mathar, Sep 17 2011
PROG
(Magma) I:=[1, 6, 21, 54]; [n le 4 select I[n] else 6*Self(n-1)-15*Self(n-2)+18*Self(n-3)-9*Self(n-4): n in [1..40]]; // Vincenzo Librandi, Sep 20 2011
CROSSREFS
Autoconvolution of A057083.
Sequence in context: A069778 A015644 A067680 * A025203 A262719 A238702
KEYWORD
sign,easy
AUTHOR
Roger L. Bagula, Feb 28 2006
STATUS
approved