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 A178735 #5 Aug 02 2015 12:54:42 %S A178735 0,8,16,24,32,40,48,56,64,88,80,104,96,120,112,136,128,136,176,184, %T A178735 160,168,208,216,192,248,240,232,224,280,272,264,256,264,272,280,352, %U A178735 360,368,376,320,344,336,424,416,440,432,392,384,392,496,504,480,488,464 %N A178735 a(n) = n XOR 9n, where XOR is bitwise XOR. %t A178735 f[n_] := BitXor[n, 9 n]; Array[f, 60, 0] (* _Robert G. Wilson v_, Jun 09 2010 *) %Y A178735 Cf. A048724, A178729, A048725, A178731, A178732, A178733, A178734, A178736. - _Robert G. Wilson v_, Jun 09 2010 %K A178735 nonn %O A178735 0,2 %A A178735 _Dmitry Kamenetsky_, Jun 08 2010 %E A178735 a(30) onwards from _Robert G. Wilson v_, Jun 09 2010