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 A057932 #20 Jan 29 2025 07:10:41 %S A057932 0,1,12,123,1234,12345,123456,1234567,12345679,123456790,1234567901, %T A057932 12345679012,123456790123,1234567901234,12345679012345, %U A057932 123456790123456,1234567901234567,12345679012345679,123456790123456790,1234567901234567901,12345679012345679012,123456790123456790123 %N A057932 a(n) = floor(10^(n+1)/81). %H A057932 Vincenzo Librandi, <a href="/A057932/b057932.txt">Table of n, a(n) for n = 0..300</a> %H A057932 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (10,0,0,0,0,0,0,0,1,-10). %t A057932 Floor[10^(Range[0, 25] + 1)/81] (* _Paolo Xausa_, Jan 29 2025 *) %o A057932 (Magma) [Floor(10^(n+1)/81): n in [1..20]]; // _Vincenzo Librandi_, Jul 07 2011 %o A057932 (PARI) a(n)=10^(n+1)\81 \\ _Charles R Greathouse IV_, Jul 07 2011 %Y A057932 Cf. A014824, A057933. %K A057932 nonn,easy %O A057932 0,3 %A A057932 _Henry Bottomley_, Oct 04 2000