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 A144746 #19 May 25 2019 01:26:49
%S A144746 6,29,811,656909,431528777371,186217085698878552894269,
%T A144746 34676803006183479266409218250231853558140150091,
%U A144746 1202480666729655584789949373132702064208272454072740050128160074167965751208292536045867158189
%N A144746 a(n) = a(n-1)^2 - a(n-1) - 1, a(0)=6.
%C A144746 a(0)=3 is the smallest integer generating an increasing sequence of the form a(n) = a(n-1)^2 - a(n-1) - 1, cf. A144743.
%F A144746 a(n) = a(n-1)^2 - a(n-1) - 1 and a(0)=6.
%F A144746 a(n) ~ c^(2^n), where c = 5.33565954034691307256446890777476398311129407641143635105306409567572... . - _Vaclav Kotesovec_, May 06 2015
%t A144746 NestList[#^2-#-1&,6,8] (* _Harvey P. Dale_, Jan 22 2011 *)
%o A144746 (PARI) a(n, s=6)={for(i=1, n, s=s^2-s-1);s} \\ _M. F. Hasler_, Oct 06 2014
%Y A144746 Cf. A000058, A082732, A144743, A144744, A144745, A144747, A144748.
%K A144746 nonn
%O A144746 0,1
%A A144746 _Artur Jasinski_, Sep 20 2008
%E A144746 Corrected and edited by _M. F. Hasler_, Oct 06 2014