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9, 69, 489, 3429, 24009, 168069, 1176489, 8235429, 57648009, 403536069, 2824752489, 19773267429, 138412872009, 968890104069, 6782230728489, 47475615099429, 332329305696009, 2326305139872069, 16284135979104489, 113988951853731429
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (8,-7).
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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), n>1.
G.f. ( 9-3*x ) / ( (7*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011
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MATHEMATICA
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10*7^Range[0, 20]-1 (* or *) LinearRecurrence[{8, -7}, {9, 69}, 20] (* Harvey P. Dale, Mar 30 2016 *)
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PROG
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(Magma) [10*7^n-1: n in [0..30]]
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CROSSREFS
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Cf. A024075, A048473, A081655, A198480, A198647.
Sequence in context: A072258 A196490 A297593 * A125372 A165147 A075045
Adjacent sequences: A198688 A198689 A198690 * A198692 A198693 A198694
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Oct 29 2011
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STATUS
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approved
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