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 A178736 #5 Aug 02 2015 12:54:21 %S A178736 0,11,22,29,44,55,58,65,88,83,110,101,116,143,130,153,176,187,166,173, %T A178736 220,199,202,241,232,227,286,277,260,319,306,297,352,363,374,381,332, %U A178736 343,346,417,440,435,398,389,404,495,482,505,464,475,454,461,572,551 %N A178736 a(n) = n XOR 10n, where XOR is bitwise XOR. %t A178736 f[n_] := BitXor[n, 10 n]; Array[f, 60, 0] (* _Robert G. Wilson v_, Jun 09 2010 *) %Y A178736 Cf. A048724, A178729, A048725, A178731, A178732, A178733, A178734, A178735. - _Robert G. Wilson v_, Jun 09 2010 %K A178736 nonn %O A178736 0,2 %A A178736 _Dmitry Kamenetsky_, Jun 08 2010 %E A178736 a(30) onwards from _Robert G. Wilson v_, Jun 09 2010