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 A178896 #5 Aug 02 2015 12:50:53 %S A178896 0,9,18,27,36,45,54,63,72,89,90,107,108,125,126,143,144,153,178,187, %T A178896 180,189,214,223,216,249,250,251,252,285,286,287,288,297,306,315,356, %U A178896 365,374,383,360,377,378,427,428,445,446,431,432,441,498,507,500,509,502 %N A178896 a(n) = n OR 9n, where OR is bitwise OR. %t A178896 f[n_] := BitOr[n, 9n]; Array[f, 55, 0] (* _Robert G. Wilson v_, Jun 28 2010 *) %Y A178896 Cf. A163617, A178890, A178891, A178892, A178893, A178894, A178895, A178897. %K A178896 nonn %O A178896 0,2 %A A178896 _Dmitry Kamenetsky_, Jun 21 2010 %E A178896 More terms from _Robert G. Wilson v_, Jun 28 2010