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A135991
Expansion of x^3*(x-1)^2*(x+1) / (x^6-3*x^5+3*x^4-x+1).
0
0, 0, 1, 0, -1, 0, -3, 0, 2, -1, 9, 0, -3, 6, -26, 2, 2, -25, 74, -16, 10, 89, -210, 85, -67, -288, 599, -375, 291, 869, -1725, 1485, -1112, -2471, 5020, -5479, 4037, 6629, -14732, 19236, -14332, -16629, 43417, -65116, 50320, 37975, -127831, 214397, -175328
OFFSET
1,7
COMMENTS
The ratio is "ringing" cyclic:
Table[N[a[[n]]/a[[n - 1]]], {n, 8, 100}]
The sequence alternates and is relatively low in value a little longer than other such sequences.
FORMULA
G.f.: x^3*(x-1)^2*(x+1) / (x^6-3*x^5+3*x^4-x+1). - Colin Barker, Feb 02 2013
MATHEMATICA
Clear[v, m, n, M0, N0] v[0] = {0, 0, 1}; v[1] = {0, 1, 2}; M0 = {{0, 1, 0}, {0, 0, 1}, {1, 0, 1}}; N0 = {{0, 1, 0}, {0, 0, 1}, {1, 1, 1}}; v[n_] := v[n] = N0.v[n - 1] - M0.v[n - 2] a = Table[v[n][[1]], {n, 0, 100}]
CROSSREFS
Sequence in context: A295041 A359710 A127913 * A331422 A279631 A102003
KEYWORD
sign,easy
AUTHOR
Roger L. Bagula, Mar 03 2008
EXTENSIONS
Better name by Colin Barker, Feb 02 2013
STATUS
approved