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
KEYWORD
nonn,easy
AUTHOR
_Olivier GĂ©rard_
STATUS
approved