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A198858
a(n) = 11*8^n-1.
1
10, 87, 703, 5631, 45055, 360447, 2883583, 23068671, 184549375, 1476395007, 11811160063, 94489280511, 755914244095, 6047313952767, 48378511622143, 387028092977151, 3096224743817215, 24769797950537727, 198158383604301823
OFFSET
0,1
FORMULA
a(n) = 8*a(n-1)+7. a(n) = 9*a(n-1)-8*a(n-2), n>1.
G.f.: ( 10-3*x ) / ( (8*x-1)*(x-1) ). - R. J. Mathar, Oct 31 2011
MAPLE
A198858:=n->11*8^n-1: seq(A198858(n), n=0..30); # Wesley Ivan Hurt, Jan 22 2017
MATHEMATICA
11*8^Range[0, 20]-1 (* or *) LinearRecurrence[{9, -8}, {10, 87}, 20] (* Harvey P. Dale, May 19 2021 *)
PROG
(Magma) [11*8^n-1: n in [0..30]]
(PARI) a(n)=11*8^n-1 \\ Charles R Greathouse IV, Jan 23 2017
CROSSREFS
Sequence in context: A264174 A218894 A251193 * A331793 A121115 A292998
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 31 2011
STATUS
approved