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 A364604 #15 Aug 10 2023 07:11:43
%S A364604 1,2,1,2,3,1,2,3,4,5,1,2,3,4,5,6,4,3,5,1,2,4,6,5,7,6,3,7,8,9,4,6,5,7,
%T A364604 8,9,1,2,7,8,6,9,10,3,8,10,9,4,7,5,10,11,12,8,11,9,10,6,11,12,13,14,
%U A364604 12,11,13,7,10,12,13,1,2,8,9,11,13,14,3,12,14,15,4,15,5,10,13,14,15,16
%N A364604 Lexicographically earliest sequence, where after every appearance, a term is banned from re-appearing for twice as long as last time; first appearance bans it for 1 term.
%e A364604 a(n) ban 1 2 3 4 5 6 ...
%e A364604 1 | | | | | |
%e A364604 2 x | | | | |
%e A364604 1 | x | | | |
%e A364604 2 x | | | | |
%e A364604 3 x x | | | |
%e A364604 1 | x x | | |
%e A364604 2 x | | | | |
%e A364604 3 x x | | | |
%e A364604 4 x x x | | |
%e A364604 5 x x x x | |
%e A364604 1 | x | | x |
%e A364604 2 x | | | | |
%e A364604 3 x x | | | |
%e A364604 4 x x x | | |
%e A364604 5 x x x x | |
%e A364604 6 x x x x x |
%e A364604 4 x x x | x x
%e A364604 3 x x | x | |
%e A364604 5 x x x x | |
%e A364604 1 | x x x x |
%e A364604 .
%e A364604 .
%e A364604 .
%o A364604 (PARI) A364604(N) = {my(a=vector(N),z=1); for(s=1,N, if(a[s],next); my(m=-1); for(i=s,N, if(!a[i], a[i]=z; i+=(1<<(m++)))); z++); a}
%o A364604 (Python)
%o A364604 def A364604(N):
%o A364604 a = [0]*N; z=s=0
%o A364604 while(s<N):
%o A364604 z+=1; m=0; i=s
%o A364604 while(i<N):
%o A364604 if not a[i]:
%o A364604 a[i]=z; i+=2**m; m+=1
%o A364604 i+=1
%o A364604 s+=1
%o A364604 return a
%Y A364604 Cf. A364603, A364448, A364449.
%K A364604 nonn
%O A364604 1,2
%A A364604 _Rok Cestnik_, Jul 29 2023