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 A334476 #11 May 04 2020 17:01:17 %S A334476 0,1,0,1,2,3,2,1,0,0,1,2,2,3,3,3,4,5,4,5,6,7,6,5,4,4,3,2,2,1,1,0,0,0, %T A334476 1,0,1,2,2,3,3,3,4,4,5,6,5,4,4,5,5,6,6,7,7,7,6,7,7,7,6,5,6,7,8,9,8,9, %U A334476 10,11,10,9,8,8,9,10,10,11,11,11,12,13,12 %N A334476 a(n) is the Y-coordinate of the n-th point of the space filling curve T defined in A334474; sequence A334475 gives X-coordinates. %H A334476 Rémy Sigrist, <a href="/A334476/b334476.txt">Table of n, a(n) for n = 0..8255</a> %H A334476 Rémy Sigrist, <a href="/A334476/a334476.gp.txt">PARI program for A334476</a> %H A334476 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a> %F A334476 A334474(a(n), A334475(n)) = n. %e A334476 The space filling curve T starts as follows: %e A334476 5| ... %e A334476 | | %e A334476 | | %e A334476 4| 16 %e A334476 | \ %e A334476 | \ %e A334476 3| 5 15-14-13 %e A334476 | |\ | %e A334476 | | \ | %e A334476 2| 4 6 11-12 %e A334476 | \ \ \ %e A334476 | \ \ \ %e A334476 1| 1 3 7 10 %e A334476 | |\ | | | %e A334476 | | \| | | %e A334476 0| 0 2 8--9 %e A334476 ---+------------- %e A334476 y/x| 0 1 2 3 %e A334476 - hence a(1) = a(3) = a(7) = a(10) = 1. %o A334476 (PARI) See Links section. %Y A334476 Cf. A334474, A334475. %K A334476 nonn,look %O A334476 0,5 %A A334476 _Rémy Sigrist_, May 02 2020