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 A153828 #4 Mar 31 2012 14:02:29 %S A153828 8,45,71,115,119,121,125,127,396,397,398,399,514,525,526,532,633,635, %T A153828 636,637,656,657,658,659,660,661,752,757,758,874,880,888,892,993,1001, %U A153828 1120,1121,1126,1127,1156,1157,1168,1169,1174,1175,1347,1394,1395 %N A153828 Index sequence to A089840: set-wise difference of A153827 and A153826. %C A153828 The terms give the positions of bijections in A089840 which preserve A129593, but not A127301. %H A153828 A. Karttunen, <a href="/A153828/b153828.txt">Table of n, a(n) for n = 0..9292</a> %H A153828 A. Karttunen, <a href="/A089839/a089839.c.txt">C-program for computing the initial terms of this sequence</a> %Y A153828 Cf. also A153829, A153830, A153831, A153832, A153833. %K A153828 nonn %O A153828 0,1 %A A153828 _Antti Karttunen_, Jan 07 2009