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 A153060 #17 Mar 06 2023 20:32:01
%S A153060 4,15,223,49726,2472675072,6114122011690205179,
%T A153060 37382487973834681475536573127118422035,
%U A153060 1397450407113894589170760370457882734663916414838438245542265330668373541218
%N A153060 a(0)=4, a(n)=a(n-1)^2 - n for n > 0.
%H A153060 <a href="/index/Aa#AHSL">Index entries for sequences of form a(n+1)=a(n)^2 + ...</a>
%F A153060 a(n) ~ c^(2^n), where c = 3.8643187364012066048723545708047003493006832597186603613771125549936188672... . - _Vaclav Kotesovec_, Dec 18 2014
%t A153060 RecurrenceTable[{a[0]==4, a[n]==a[n-1]^2-n}, a, {n, 0, 10}] (* _Vaclav Kotesovec_, Dec 18 2014 *)
%Y A153060 Cf. A153059.
%K A153060 nonn
%O A153060 0,1
%A A153060 _Vladimir Joseph Stephan Orlovsky_, Dec 17 2008
%E A153060 Definition amended by _Georg Fischer_, Jul 15 2022