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 A256423 #13 Apr 13 2015 14:54:59 %S A256423 8,39203,72899,324899,359999,675683,777923,1127843,4536899,6718463, %T A256423 10036223,30272003,44916803,54022499,100761443,108743183,110249999, %U A256423 212051843,233722943,289952783,326163599,388011203,395612099,431475983 %N A256423 Consider numbers n such that A166133(n) sets a new record and also satisfies A166133(n)=A166133(n-1)^2-1; sequence gives values of A166133(n). %C A256423 A subsequence of A256403. %C A256423 The points (A256422(i), A256423(i)) form the upper envelope of A166133. %H A256423 N. J. A. Sloane and Ray Chandler, <a href="/A256423/b256423.txt">Table of n, a(n) for n = 1..127</a> (first 100 terms from N. J. A. Sloane) %H A256423 N. J. A. Sloane and others, <a href="/A166133/a166133.txt">"Blog" about A166133</a> %e A256423 A166133(5) = 8 = A166133(4)^2-1 = 9-1. %Y A256423 Cf. A166133, A256422, A256403, A256404. %K A256423 nonn %O A256423 1,1 %A A256423 _N. J. A. Sloane_, Apr 08 2015