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 A275877 #8 Aug 16 2016 20:32:15 %S A275877 1,2,3,4,5,8,6,11,7,12,15,16,10,9,17,19,13,24,25,22,14,18,31,27,20,26, %T A275877 33,21,34,37,38,43,35,39,36,40,23,49,41,28,52,29,47,32,53,46,44,55,30, %U A275877 60,54,45,61,48,50,66,51,73,57,70,71,76,78,83,81,77,72,65 %N A275877 Numbers on the East-West axis of A274640 in order of appearance. %C A275877 Conjectured to be a permutation of the natural numbers. %H A275877 Alois P. Heinz, <a href="/A275877/b275877.txt">Table of n, a(n) for n = 1..2000</a> %Y A275877 Cf. A274640. %Y A275877 Alternate terms of A274924 and A274928 (starting with a single 1). %K A275877 nonn %O A275877 1,2 %A A275877 _N. J. A. Sloane_, Aug 16 2016