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 A122228 #5 Jul 23 2025 16:43:27 %S A122228 0,1,3,8,20,55,160,493,1579,5212,17595,60462,210749,743284,2647461, %T A122228 9509504 %N A122228 Iterates of A122227, starting from 0. %o A122228 (Scheme) (define (A122228 n) (if (zero? n) 0 (A122227 (A122228 (- n 1))))) %Y A122228 Cf. A122229, A122230, A106191. %K A122228 nonn %O A122228 0,3 %A A122228 _Antti Karttunen_, Sep 14 2006