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A193577
a(n) = 5*7^n.
4
5, 35, 245, 1715, 12005, 84035, 588245, 4117715, 28824005, 201768035, 1412376245, 9886633715, 69206436005, 484445052035, 3391115364245, 23737807549715, 166164652848005, 1163152569936035, 8142067989552245, 56994475926865715
OFFSET
0,1
FORMULA
G.f.: 5/(1-7*x).
a(n) = 7*a(n-1), a(0)=5.
MATHEMATICA
5 7^Range[0, 20] (* or *) NestList[7#&, 5, 20] (* Harvey P. Dale, Dec 10 2017 *)
PROG
(Magma) [5*7^n: n in [0..20]];
CROSSREFS
Cf. A005055.
Sequence in context: A290903 A155127 A239846 * A196661 A104532 A292839
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Sep 15 2011
STATUS
approved