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 A132135 #6 Mar 30 2012 18:34:46 %S A132135 2,3,4,10,20,51,133,359,975,2700,7506,20962,58968,166170 %N A132135 Number of base-3 "Punctual Birds" with n base-3 digits. %e A132135 a(2)=3 because 3 of the six 2-digit base-3 numbers appear in their natural order in the string of concatenated base-3 numbers. These 3 numbers are 3, 4 and 6 (10, 11 and 20 base-3). %Y A132135 Cf. A132134. %K A132135 nonn,base %O A132135 1,1 %A A132135 _Graeme McRae_, Aug 11 2007