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 A173096 #6 Aug 31 2023 15:59:02
%S A173096 3,4,5,11,39,379,14363,5428835,77968913907,423280290755965603,
%T A173096 33002704548058529678235461411,
%U A173096 13969394376835442790478317113350745782558418819,461027795334010317786933009714496751421279215574147082960119439306256813379
%N A173096 a(1) = 3, a(2) = 4, a(n) = a(n-2)*a(n-1)-a(n-2)-a(n-1).
%t A173096 a=3;b=4;lst={a,b};Do[c=a*b-a-b;AppendTo[lst,c];a=b;b=c,{n,12}];lst
%t A173096 nxt[{a_,b_}]:={b,a*b-a-b}; NestList[nxt,{3,4},15][[;;,1]] (* _Harvey P. Dale_, Aug 31 2023 *)
%Y A173096 Cf. A173093, A173094.
%K A173096 nonn
%O A173096 1,1
%A A173096 _Vladimir Joseph Stephan Orlovsky_, Feb 09 2010