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A034491
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a(n) = 7^n + 1.
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49
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2, 8, 50, 344, 2402, 16808, 117650, 823544, 5764802, 40353608, 282475250, 1977326744, 13841287202, 96889010408, 678223072850, 4747561509944, 33232930569602, 232630513987208, 1628413597910450, 11398895185373144
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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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a(n) = 7*a(n-1) - 6.
a(n) = 8*a(n-1) - 7*a(n-2).
G.f.: 1/(1-x) + 1/(1-7*x).
E.g.f.: exp(x) + exp(7*x). (End)
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MATHEMATICA
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7^Range[0, 30] +1
LinearRecurrence[{8, -7}, {2, 8}, 20] (* Harvey P. Dale, Aug 18 2018 *)
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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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