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A133667
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a(n) = a(n-1) - 25*a(n-2), a(0)=1, a(1)=5.
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1
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1, 5, -20, -145, 355, 3980, -4895, -104395, 17980, 2627855, 2178355, -63518020, -117976895, 1469973605, 4419395980, -32329944145, -142814843645, 665433759980, 4235804851105, -12400039148395, -118295160426020, 191705818283855
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: (1+4*x)/(1-x+25*x^2).
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MATHEMATICA
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LinearRecurrence[{1, -25}, {1, 5}, 22] (* Georg Fischer, May 02 2019 *)
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PROG
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(PARI) Vec((1+4*x)/(1-x+25*x^2) + O(x^30)) \\ Michel Marcus, May 02 2019
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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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