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 A080266 #5 Jan 11 2024 10:52:16 %S A080266 0,2,28,3995,53032,9218158,1716408828,68406706423034,993609159645474, %T A080266 211483814340246174,45849905806140642231,2254554272777258549734599, %U A080266 509234594705250632023415288,26692711238971831653512953923634 %N A080266 a(n) = A080301(A080263(n)). %Y A080266 Cf. A080265. %K A080266 nonn %O A080266 0,2 %A A080266 _Antti Karttunen_, Mar 02 2003