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A155634
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7^n + 5^n - 1.
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17
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1, 11, 73, 467, 3025, 19931, 133273, 901667, 6155425, 42306731, 292240873, 2026154867, 14085427825, 98109713531, 684326588473, 4778079088067, 33385518460225, 233393453440331, 1632228295176073, 11417968671701267
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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/(1-7*x)+1/(1-5*x)-1/(1-x). E.g.f.: e^(7*x)+e^(5*x)-e^x.
a(n)=12*a(n-1)-35*a(n-2)-24 with a(0)=1, a(1)=11 [From Vincenzo Librandi, Jul 21 2010]
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MATHEMATICA
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Table[7^n+5^n-1, {n, 0, 30}] (* or *) LinearRecurrence[{13, -47, 35}, {1, 11, 73}, 30] (* Harvey P. Dale, Jun 02 2021 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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