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%I #8 Sep 08 2022 08:44:40
%S 1,10,101,10201,10211201,102122221201,10212324242321201,
%T 10212334454645443321201,102123354758788887857453321201,
%U 10212335578002243544534219977553321201
%N a(0)=1, a(1)=10, a(n) = sum_{k=0}^{k=n-1} 10^k a(k).
%F a(n) = (10^(n-2) + 1) * a(n-1). - _Vincenzo Librandi_, Nov 11 2012
%o (Magma) I:=[1, 10, 101]; [n le 3 select I[n] else (10^(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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