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 A055116 #13 Mar 31 2017 22:26:13 %S A055116 0,5,4,3,2,1,30,35,34,33,32,31,24,29,28,27,26,25,18,23,22,21,20,19,12, %T A055116 17,16,15,14,13,6,11,10,9,8,7,180,185,184,183,182,181,210,215,214,213, %U A055116 212,211,204,209,208,207,206,205,198,203,202,201,200,199,192,197,196 %N A055116 Base-6 complement of n (write n in base 6, then replace each digit with its base-6 negative). %H A055116 Alois P. Heinz, <a href="/A055116/b055116.txt">Table of n, a(n) for n = 0..7775</a> %H A055116 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A055116 Cf. A004488, A048647, A055115-A055126. %Y A055116 Column k=6 of A248813. %K A055116 base,easy,nonn %O A055116 0,2 %A A055116 _Henry Bottomley_, Apr 19 2000