This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A178512 #26 Mar 16 2024 11:19:09 %S A178512 1,121,14521,1742521,209102521,25092302521,3011076302521, %T A178512 361329156302521,43359498756302521,5203139850756302521, %U A178512 624376782090756302521,74925213850890756302521,8991025662106890756302521,1078923079452826890756302521,129470769534339226890756302521 %N A178512 Reversed decimal expansions of A178510. %C A178512 Related to backward decimal expansion of fraction 1/119 and Pell numbers. [How? - _Joerg Arndt_, May 14 2011] %H A178512 Vincenzo Librandi, <a href="/A178512/b178512.txt">Table of n, a(n) for n = 1..150</a> %H A178512 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (121,-120). %F A178512 a(n) = 120*a(n-1) + 1. %F A178512 From _Colin Barker_, Oct 02 2015: (Start) %F A178512 a(n) = 121*a(n-1) - 120*a(n-2) for n > 2. %F A178512 G.f.: x / ((x-1)*(120*x-1)). %F A178512 (End) %t A178512 NestList[120#+1&,1,20] (* _Harvey P. Dale_, May 21 2023 *) %o A178512 (Magma) [(1/119)*(120^n-1): n in [1..20]]; // _Vincenzo Librandi_, May 17 2011 %o A178512 (PARI) Vec(x/((x-1)*(120*x-1)) + O(x^20)) \\ _Colin Barker_, Oct 02 2015 %Y A178512 Cf. A000129, A021083, A038207, A178510, A178511. %K A178512 nonn,base,easy %O A178512 1,2 %A A178512 _Mark Dols_, May 29 2010