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A015501 a(0)=1, a(1)=12, a(n) = sum_{k=0}^{k=n-1} 12^k a(k). 0

%I

%S 1,12,145,21025,36352225,753836089825,187579295739424225,

%T 560108963388484644486625,20069717395324174580677650054625,

%U 8629611143951908451324039380459800198625

%N a(0)=1, a(1)=12, a(n) = sum_{k=0}^{k=n-1} 12^k a(k).

%F a(n) = (12^(n-2) + 1) * a(n-1). - _Vincenzo Librandi_, Nov 11 2012

%o (MAGMA) I:=[1, 12, 145]; [n le 3 select I[n] else (12^(n-2)+1)*Self(n-1): n in [1..15]]; // _Vincenzo Librandi_, Nov 11 2012

%K nonn,easy

%O 0,2

%A _Olivier GĂ©rard_

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Last modified January 17 15:20 EST 2022. Contains 350402 sequences. (Running on oeis4.)