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 A248545 #14 Jan 09 2025 09:58:18
%S A248545 0,75,5700,32490075,1055604973505700,1114301860089969598947932490075,
%T A248545 1241668635399966182910364962424859894024949485439789973505700
%N A248545 a(n+1) = a(n)^2 + 75.
%C A248545 Dedicated to N. J. A. Sloane for his 75th birthday!
%H A248545 A. V. Aho and N. J. A. Sloane, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Scanned/11-4/aho-a.pdf">Some doubly exponential sequences</a>, Fibonacci Quarterly, Vol. 11, No. 4 (1973), pp. 429-437.
%H A248545 A. V. Aho and N. J. A. Sloane, <a href="/A000058/a000058.pdf">Some doubly exponential sequences</a>, Fibonacci Quarterly, Vol. 11, No. 4 (1973), pp. 429-437 (original plus references that F.Q. forgot to include - see last page!)
%H A248545 <a href="/index/Aa#AHSL">Index entries for sequences of form a(n+1)=a(n)^2 + ...</a>
%F A248545 a(n) ~ c^(2^n), where c = 8.688980833378203252201919626948141475048572223268...
%t A248545 RecurrenceTable[{a[n+1]==a[n]^2+75,a[0]==0},a,{n,0,10}]
%t A248545 NestList[#^2+75&,0,10] (* _Harvey P. Dale_, Jan 14 2016 *)
%Y A248545 Cf. A003095.
%K A248545 nonn
%O A248545 0,2
%A A248545 _Vaclav Kotesovec_, Oct 08 2014