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 A286294 #36 Jun 24 2017 05:32:51 %S A286294 0,1,3,2,5,4,6,8,7,11,9,10,12,13,15,14,16,18,17,19,20,22,21,23,25,24, %T A286294 27,26,28,29,31,30,32,33,35,34,36,38,37,40,39,41,44,42,43,45,46,47,49, %U A286294 48,50,51,53,52,54,55,57,56,58,60,59,62,61,64,65,63,66,68,67,70,71,69,72,73,75,74,76,77,78 %N A286294 Leading column of right triangle in A274650. %C A286294 Theorem: This is a permutation of the positive integers. For proof, see link in A274650. - _N. J. A. Sloane_, Jun 07 2017 %H A286294 Alois P. Heinz, <a href="/A286294/b286294.txt">Table of n, a(n) for n = 0..1000</a> %F A286294 a(n) = A274650(n,0) = A274651(n+1,1) - 1. - _Hartmut F. W. Hoft_, Jun 13 2017 %t A286294 (* function a274651[] is defined in A274651 for n>=1 *) %t A286294 a286294[n_] := Map[First, a274651[n+1]-1] %t A286294 a286294[78] (* data *) (* _Hartmut F. W. Hoft_, Jun 13 2017 *) %Y A286294 Cf. A274650, A274651, A286295, A288384, A288424. %K A286294 nonn %O A286294 0,3 %A A286294 _N. J. A. Sloane_, May 30 2017