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A085640 Resultant of the polynomial x^3-1 and the Chebyshev polynomial of the first kind T_n(x). 1
1, 7, 37, 193, 1021, 5383, 28393, 149761, 789913, 4166407, 21975757, 115911361, 611375701, 3224707591, 17008754257, 89712854017, 473191396273, 2495853018631, 13164403113973, 69435783298753, 366239772557101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

FORMULA

G.f. (1+3*x+3*x^2-x^3)/(1-4*x-6*x^2-4*x^3+x^4) (conjecture). Generating floretion C*F with C = 0.5('k + k' - 'j - j' - ki - 2ii - ik - ij - ji) and F = .5('k + ki + 'j + ji). [From Creighton Dement, Jan 17 2009]

PROG

(PARI) Tnmin2 = 1; Tnmin1 = x; print(polresultant(x^3 - 1, Tnmin1)); for (n = 2, 30, T = 2*x*Tnmin1 - Tnmin2; print(polresultant(x^3 - 1, T)); Tnmin2 = Tnmin1; Tnmin1 = T); (Wasserman)

CROSSREFS

Cf. A086840.

Sequence in context: A140476 A057651 A106925 * A196805 A069378 A287808

Adjacent sequences:  A085637 A085638 A085639 * A085641 A085642 A085643

KEYWORD

nonn

AUTHOR

Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 15 2003

EXTENSIONS

More terms from David Wasserman, Feb 08 2005

STATUS

approved

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Last modified October 26 08:06 EDT 2020. Contains 338027 sequences. (Running on oeis4.)