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 A051244 #8 Aug 20 2021 05:51:27 %S A051244 2,4,6,8,11,13,14,16,19,20,23,25,26,29,30,32,35,37,41,44,47,49,50,55, %T A051244 59,61,62,64,67,69,72,75,77,81,84,87,89,92,95,97,98,103,105,106,111, %U A051244 115,117,118,123,125,126,128,131,133,137,145,152 %N A051244 Binary numbers d(1)...d(j) such that d(i) = d(j+1-i) for all but two values of i. %C A051244 Each number becomes a palindrome by changing one digit. %Y A051244 Cf. A051247, A050874. %K A051244 nonn,base %O A051244 1,1 %A A051244 _Clark Kimberling_ %E A051244 Name corrected by _Sean A. Irvine_, Aug 20 2021