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 A136602 #5 Mar 31 2012 20:35:48 %S A136602 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25, %T A136602 26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48, %U A136602 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72 %N A136602 Nonnegative numbers that can be obtained by inserting minus and plus-signs in 123456789. %C A136602 A066957(a(n)) > 0; complement of A136601; A136603 is a subsequence; %C A136602 a(n) = n-1 for n <= 211 = A136601(1). %C A136602 The sequence is finite: a(1715) = 123456789 is the last term. %H A136602 R. Zumkeller, <a href="/A136602/b136602.txt">Table of n, a(n) for n = 1..1715</a> %K A136602 nonn,fini,base %O A136602 1,3 %A A136602 _Reinhard Zumkeller_, Jan 12 2008