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 A127861 #9 Jul 29 2023 05:00:59 %S A127861 49,6241,889249,127938721,18421818529,2652725580961,381992288212129, %T A127861 55006887157191841,7920991722491368609,1140622807701026002081, %U A127861 164249684304894971368609,23651954539856242601907361 %N A127861 a(n) = A127859(n)^2. %C A127861 In base 12 the sequence is 41, 3741, 36X741, 36X1X741, 36X151X741, 36X14851X741, 36X147E851X741, 36X147E2E851X741, 36X147E262E851X741, 36X147E25962E851X741, where X is 10 and E is 11. %F A127861 a(n) = (6*(12^n - 1)/11 + 1)^2 = A127860(n) + (12^(2*n) - 1)/11. - _Max Alekseyev_, Jul 27 2023 %e A127861 a(1) = A127859(1)^2 = 7^2 = 49. %Y A127861 Cf. A117755, A127856, A127857, A127858, A127859, A127860, A192544. %K A127861 nonn,base %O A127861 1,1 %A A127861 _Walter Kehowski_, Feb 04 2007 %E A127861 Edited by _Max Alekseyev_, Jul 27 2023