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 A381490 #15 Mar 06 2025 14:45:34 %S A381490 0,1,0,1,0,1,0,1,2,3,2,3,2,3,2,3,0,1,0,1,0,1,0,1,2,3,2,3,2,3,2,3,4,5, %T A381490 4,5,4,5,4,5,6,7,6,7,6,7,6,7,4,5,4,5,4,5,4,5,6,7,6,7,6,7,6,7,8,9,8,9, %U A381490 8,9,8,9,10,11,10,11,10,11,10,11,8,9,8,9,8,9,8,9 %N A381490 Index of second half of decomposition of integers into pairs x(i)+y(j) based on A380008 and A380009, respectively. %C A381490 One coordinate of a recursive non-self-intersecting walk on the square lattice Z^2. %C A381490 Every integer appears infinitely many times in the sequence. %H A381490 Luis Rato, <a href="/A380009/a380009.png">Plot of an NZ-order curve</a>, containing the integers from 0 to 255. %H A381490 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a> %F A381490 n = A380008(A381489(n)) + A380009(a(n)) %e A381490 A380008( A381489(14)) + A380009(a(14)) = A380008(3) + A380009(2) = 6+8 = 14 %Y A381490 Cf. A381489 %Y A381490 Cf. A380008 (indices of 0's), A380009. %K A381490 easy,nonn %O A381490 0,9 %A A381490 _Luis Rato_, Feb 25 2025