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A144701 Hankel transform of expansion of 1/c(x)^3, c(x) the g.f. of A000108. 0
1, -9, 26, -25, -36, 133, -132, -81, 375, -374, -144, 806, -805, -225, 1480, -1479, -324, 2451, -2450, -441, 3773, -3772, -576, 5500, -5499, -729, 7686, -7685, -900, 10385, -10384, -1089, 13651, -13650, -1296, 17538, -17537 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform of A115142.

LINKS

Table of n, a(n) for n=0..36.

Index entries for linear recurrences with constant coefficients, signature (-4,-10,-16,-19,-16,-10,-4,-1).

FORMULA

G.f.: (1+x)(1-x)(1-5x+x^2)/(1+x+x^2)^4;

a(n)=-(2n^3+9n^2+7n-6)*cos(2*pi*n/3)/6-sqrt(3)*(2n^3+21n^2+55n+42)*sin(2*pi*n/3)/18;

CROSSREFS

Sequence in context: A117755 A144114 A209969 * A255107 A022421 A075395

Adjacent sequences:  A144698 A144699 A144700 * A144702 A144703 A144704

KEYWORD

easy,sign

AUTHOR

Paul Barry, Sep 19 2008

STATUS

approved

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Last modified February 20 04:12 EST 2020. Contains 332063 sequences. (Running on oeis4.)