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 A122231 #7 Jul 23 2025 17:24:33 %S A122231 4,17,64,183,560,2036,6397,20414,79204,262714,870210,3640880 %N A122231 Iterates of A122227, starting from A122227(4)=17. %o A122231 (Scheme) (define (A122231 n) (if (= 1 n) 4 (A122227 (A122231 (- n 1))))) %Y A122231 Cf. A122232, A122233. %K A122231 nonn,more %O A122231 1,1 %A A122231 _Antti Karttunen_, Sep 14 2006