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A090133
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Expansion of (1+4x)/(1+4x+5x^2).
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0
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1, 0, -5, 20, -55, 120, -205, 220, 145, -1680, 5995, -15580, 32345, -51480, 44195, 80620, -543455, 1770720, -4365605, 8608820, -12607255, 7384920, 33496595, -170910980, 516160945, -1210088880, 2259550795, -2987758780, 653281145, 12325669320
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OFFSET
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0,3
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REFERENCES
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D. Cvijovic, J Klinowski, An Application for the Chebyshev Polynomials, Mat. Vesnik 50 (1998) 105-110
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LINKS
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FORMULA
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a(n)=sum{k=0..n, C(n, k)(-2)^(n-k)(-1)^floor(k/2)(1+(1-(-1)^k)/2) }
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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