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 A065367 #2 Mar 30 2012 17:38:10 %S A065367 1,-4,-3,-2,11,12,13,8,9,10,5,6,7,-34,-33,-32,-37,-36,-35,-40,-39,-38, %T A065367 -25,-24,-23,-28,-27,-26,-31,-30,-29,-16,-15,-14,-19,-18,-17,-22,-21, %U A065367 -20,101,102,103,98,99,100,95,96,97,110,111,112,107,108,109,104,105,106,119,120,121,116,117,118,113 %N A065367 Replace 3^k with (-3)^k in balanced ternary expansion of n. %C A065367 Notation: (3)< n >(-3) %e A065367 5 = +1(9)-1(3)-1(1) -> +1(9)-1(-3)-1(1) = 11 = a(5) %Y A065367 A053985, A065364, A065366, A065369 %K A065367 base,easy,sign %O A065367 1,2 %A A065367 _Marc LeBrun_, Oct 31 2001