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A144701
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Hankel transform of expansion of 1/c(x)^3, c(x) the g.f. of A000108.
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0
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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; internal format)
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OFFSET
| 0,2
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COMMENTS
| Hankel transform of A115142.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (-4,-10,-16,-19,-16,-10,-4,-1).
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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;
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CROSSREFS
| Sequence in context: A038534 A117755 A144114 * A022421 A075395 A085367
Adjacent sequences: A144698 A144699 A144700 * A144702 A144703 A144704
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KEYWORD
| easy,sign
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Sep 19 2008
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