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A074613
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a(n) = 4^n + 7^n.
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3
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2, 11, 65, 407, 2657, 17831, 121745, 839927, 5830337, 40615751, 283523825, 1981521047, 13858064417, 96956119271, 678491508305, 4748635251767, 33237225536897, 232647693856391, 1628482317387185, 11399170063280087
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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/(1-4*x) + 1/(1-7*x).
E.g.f.: e^(4*x) + e^(7*x). (End)
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MATHEMATICA
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Table[4^n + 7^n, {n, 0, 25}]
LinearRecurrence[{11, -28}, {2, 11}, 30] (* Harvey P. Dale, Oct 03 2013 *)
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PROG
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(SageMath) [4^n+7^n for n in range(31)] # G. C. Greubel, Mar 10 2023
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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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