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 A205105 #6 Mar 30 2012 18:58:10 %S A205105 4,18,14,64,60,46,210,206,192,146,664,660,646,600,454,2058,2054,2040, %T A205105 1994,1848,1394,6304,6300,6286,6240,6094,5640,4246,19170,19166,19152, %U A205105 19106,18960,18506,17112,12866,58024,58020,58006,57960,57814 %N A205105 Ordered differences of numbers 3^j-2^j, as in A001047. %C A205105 For a guide to related sequences, see A204892. %e A205105 a(1)=s(2)-s(1)=(3^2-2^2)-(3^1-2^1)=4 %e A205105 a(2)=s(3)-s(1)=19-1=18 %e A205105 a(3)=s(3)-s(2)=19-5=14 %e A205105 a(4)=s(4)-s(1)=65-1=64 %t A205105 (See the program at A205000.) %Y A205105 Cf. A205000, A204892. %K A205105 nonn %O A205105 1,1 %A A205105 _Clark Kimberling_, Jan 22 2012