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 A256543 #6 Apr 03 2015 10:55:04 %S A256543 1,3,5,6,7,9,10,11,13,14,15,17,18,19,20,22,23,26,27,28,30,31,32,33,34, %T A256543 35,36,37,38,39,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58, %U A256543 59,60,61,62,63,64,65,66,67,68,71,72,73,74,75,76,77,78 %N A256543 Numbers m such that A256541(m) = -1 or = +1. %C A256543 abs(A166133(n+1) - A166133(n)) = abs(A256541(n)) = 1. %H A256543 Reinhard Zumkeller, <a href="/A256543/b256543.txt">Table of n, a(n) for n = 1..10000</a> %o A256543 (Haskell) %o A256543 a256543 n = a256543_list !! (n-1) %o A256543 a256543_list = [x | x <- [1..], abs (a256541 x) == 1] %Y A256543 Cf. A256541, A166133. %K A256543 nonn %O A256543 1,2 %A A256543 _Reinhard Zumkeller_, Apr 02 2015