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%I #8 Sep 08 2022 08:44:40
%S 1,9,82,6724,4908520,32209708240,1901983271572000,
%T 1010793793810766824000,4834596391983083396187280000,
%U 208113526867898819658489702096160000,80627444554789525982513713046048334318400000
%N a(0)=1, a(1)=9, a(n) = sum_{k=0}^{k=n-1} 9^k a(k).
%F a(n) = (9^(n-2) + 1) * a(n-1). - _Vincenzo Librandi_, Nov 11 2012
%o (Magma) I:=[1, 9, 82]; [n le 3 select I[n] else (9^(n-2)+1)*Self(n-1): n in [1..15]]; // _Vincenzo Librandi_, Nov 11 2012
%K nonn,easy
%O 0,2
%A _Olivier Gérard_
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