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 A059144 #11 Sep 13 2022 09:31:38
%S A059144 15,24,15,33,15,24,15,42,15,24,15,33,15,24,15,51,15,24,15,33,15,24,15,
%T A059144 42,15,24,15,33,15,24,15,60,15,24,15,33,15,24,15,42,15,24,15,33,15,24,
%U A059144 15,51,15,24,15,33,15,24,15,42,15,24,15,33,15,24,15,69,15,24,15,33,15
%N A059144 A hierarchical sequence (W3{2,2}*cc - see A059126).
%H A059144 Jonas Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%F A059144 a(n) = A059143(3*n) + A059143(3*n+1) + A059143(3*n+2). - _Sean A. Irvine_, Sep 13 2022
%Y A059144 Cf. A059126, A059143.
%K A059144 easy,nonn
%O A059144 0,1
%A A059144 _Jonas Wallgren_, Jan 19 2001