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A199216
6*5^n+1.
1
7, 31, 151, 751, 3751, 18751, 93751, 468751, 2343751, 11718751, 58593751, 292968751, 1464843751, 7324218751, 36621093751, 183105468751, 915527343751, 4577636718751, 22888183593751, 114440917968751, 572204589843751, 2861022949218751
OFFSET
0,1
FORMULA
a(n) = 5*a(n-1)-4.
a(n) = 6*a(n-1)-5*a(n-2).
G.f.: (7-11*x)/((1-x)*(1-5*x)).
MATHEMATICA
6*5^Range[0, 30]+1 (* or *) LinearRecurrence[{6, -5}, {7, 31}, 30] (* Harvey P. Dale, May 14 2017 *)
PROG
(Magma) [6*5^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A086901 A003526 A121517 * A057620 A055625 A102239
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 05 2011
STATUS
approved