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 A127860 #11 Jul 29 2023 05:00:50 %S A127860 36,4356,617796,88849476,12792967236,1842170994756,265272427798596, %T A127860 38199227257643076,5500688696956346436,792099172023982809156, %U A127860 114062280767400751587396,16424968430457074953412676 %N A127860 a(n) = A127858(n)^2. %C A127860 In base 12 the sequence is 30, 2630, 259630, 25909630, 2590409630, 259037409630, 259036X7409630, 259036X1X7409630, 259036X151X7409630, 259036X14851X7409630, where X is 10 and E is 11. %F A127860 a(n) = (5*(12^n - 1)/11 + 1)^2 = A127861(n) - (12^(2*n) - 1)/11.. - _Max Alekseyev_, Jul 27 2023 %e A127860 a(1) = A127858(1)^2 = 6^2 = 36. %Y A127860 Cf. A117755, A127856, A127857, A127858, A127859, A127861, A192544. %K A127860 nonn,base %O A127860 1,1 %A A127860 _Walter Kehowski_, Feb 04 2007 %E A127860 Edited by _Max Alekseyev_, Jul 27 2023