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 A178732 #5 Aug 02 2015 12:55:46 %S A178732 0,7,14,17,28,27,34,45,56,63,54,73,68,67,90,85,112,119,126,97,108,107, %T A178732 146,157,136,143,134,185,180,179,170,165,224,231,238,241,252,251,194, %U A178732 205,216,223,214,297,292,291,314,309,272,279,286,257,268,267,370,381 %N A178732 a(n) = n XOR 6n, where XOR is bitwise XOR. %t A178732 f[n_] := BitXor[n, 6 n]; Array[f, 60, 0] (* _Robert G. Wilson v_, Jun 09 2010 *) %Y A178732 Cf. A048724, A178729, A048725, A178731, A178733, A178734, A178735, A178736. - _Robert G. Wilson v_, Jun 09 2010 %K A178732 nonn %O A178732 0,2 %A A178732 _Dmitry Kamenetsky_, Jun 08 2010 %E A178732 a(30) onwards from _Robert G. Wilson v_, Jun 09 2010