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A015490
a(0)=1, a(1)=5, a(n) = sum_{k=0}^{k=n-1} 5^k a(k).
0
1, 5, 26, 676, 85176, 53320176, 166678870176, 2604524025370176, 203481044006070370176, 79484986295915244420370176, 155244193344195757673779920370176, 1516056730871105040228764708644920370176
OFFSET
0,2
FORMULA
a(n) = (5^(n-2) + 1) * a(n-1). - _Vincenzo Librandi_, Nov 11 2012
PROG
(Magma) I:=[1, 5, 26]; [n le 3 select I[n] else (5^(n-2)+1)*Self(n-1): n in [1..15]]; // _Vincenzo Librandi_, Nov 11 2012
CROSSREFS
Sequence in context: A156217 A156216 A320987 * A118366 A226125 A132509
KEYWORD
nonn,easy
AUTHOR
_Olivier GĂ©rard_
STATUS
approved