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 A051245 #7 Aug 20 2021 06:12:42 %S A051245 3,8,11,13,14,34,36,39,40,43,46,48,53,54,57,58,60,134,138,140,143,146, %T A051245 148,151,158,162,168,171,174,176,179,182,186,196,200,205,206,208,213, %U A051245 214,220,224,233,234,236,241,242,244,248,526 %N A051245 Binary numbers d(1)...d(j) such that d(i) != d(j+1-i) for all but two values of i. %Y A051245 Cf. A051244. %K A051245 nonn,base %O A051245 1,1 %A A051245 _Clark Kimberling_ %E A051245 Name corrected by _Sean A. Irvine_, Aug 20 2021