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 A122227 #4 Jun 02 2025 00:30:17 %S A122227 1,3,7,8,17,18,21,22,20,45,46,49,50,48,58,59,63,64,62,54,55,57,61,129, %T A122227 130,133,134,132,142,143,147,148,146,138,139,141,145,170,171,175,176, %U A122227 174,189,190,195,196,194,184,185,188,193,157,158,161,162,160,169,173 %N A122227 a(n) = A057548(A057117(n)). %Y A122227 Iterates: A122228, A122231, A122234, A122238. Cf. A080067, A122237. %K A122227 nonn %O A122227 0,2 %A A122227 _Antti Karttunen_, Sep 14 2006