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A052208
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a(n) = Pell(n)*Pell(2*n)/2.
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1
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0, 1, 12, 175, 2448, 34481, 485100, 6826079, 96049728, 1351523425, 19017374892, 267594778639, 3765344259600, 52982414452241, 745519146496332, 10490250465629375, 147609025664755968, 2077016609773544641, 29225841562491165900, 411238798484657629039
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listen;
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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^3+x)/((1+2x-x^2)*(1-14x-x^2)).
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MATHEMATICA
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CoefficientList[Series[(x^3+x)/((1+2x-x^2)(1-14x-x^2)), {x, 0, 30}], x] (* Harvey P. Dale, Dec 20 2018 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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