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A093144
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Third binomial transform of Pell(3*n)/Pell(3).
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2
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0, 1, 20, 350, 6000, 102500, 1750000, 29875000, 510000000, 8706250000, 148625000000, 2537187500000, 43312500000000, 739390625000000, 12622187500000000, 215474218750000000, 3678375000000000000
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OFFSET
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0,3
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LINKS
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FORMULA
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G.f.: x/(1-20*x+50*x^2);
a(n) = ((10 + 5*sqrt(2))^n - (10 - 5*sqrt(2))^n)/(10*sqrt(2)).
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MATHEMATICA
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LinearRecurrence[{20, -50}, {0, 1}, 30] (* Harvey P. Dale, Aug 04 2021 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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