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A074536
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a(n) = 2^n + 4^n + 9^n.
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1
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3, 15, 101, 801, 6833, 60105, 535601, 4799481, 43112513, 387683145, 3487834001, 31385255961, 282446317793, 2541932945385, 22877060906801, 205892205869241, 1853024483884673, 16677198879666825, 150094704016738001
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listen;
history;
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internal format)
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: 1/(1-2*x) + 1/(1-4*x) + 1/(1-9*x).
E.g.f.: exp(2*x) + exp(4*x) + exp(9*x). (End)
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MATHEMATICA
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Table[2^n + 4^n + 9^n, {n, 0, 20}]
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PROG
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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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