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 A319572 #12 Feb 05 2021 03:50:09
%S A319572 0,0,1,2,1,0,0,1,2,3,4,3,2,1,0,0,1,2,3,4,5,6,5,4,3,2,1,0,0,1,2,3,4,5,
%T A319572 6,7,8,7,6,5,4,3,2,1,0,0,1,2,3,4,5,6,7,8,9,10,9,8,7,6,5,4,3,2,1,0,0,1,
%U A319572 2,3,4,5,6,7,8,9,10,11,12,11,10,9,8,7,6
%N A319572 The x coordinates of the stripe enumeration of N X N where N = {0, 1, 2, ...}.
%C A319572 See A319571 for comments and references.
%H A319572 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a>
%o A319572 (Julia)
%o A319572 # Function stripe is defined in A319571.
%o A319572 function StripeEnumerationX(len)
%o A319572 x, y, state = 0, 0, false
%o A319572 for n in 0:len
%o A319572 print("$x, ")
%o A319572 x, y, state = stripe(x, y, state)
%o A319572 end
%o A319572 end
%o A319572 StripeEnumerationX(84)
%Y A319572 Cf. A319571 (stripe enumeration), this sequence (stripe x), A319573 (stripe y).
%Y A319572 Cf. A319514 (shell enumeration), A319289 (shell x), A319290 (shell y).
%K A319572 nonn
%O A319572 0,4
%A A319572 _Peter Luschny_, Sep 23 2018