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 A338503 #9 Nov 03 2020 03:24:53 %S A338503 0,1,2,0,3,1,4,0,5,1,6,7,4,2,3,6,2,5,7,1,8,10,9,5,6,4,8,11,6,10,7,0,9, %T A338503 3,7,9,6,8,2,11,4,10,1,11,3,8,5,12,14,13,6,12,15,10,14,8,15,11,0,12,4, %U A338503 13,1,12,2,13,0,14,9,15,6,14,11,13,10,12,3,15 %N A338503 a(n) is the square root of A338502(1) XOR ... XOR A338502(n) (where XOR denotes the bitwise XOR operator). %H A338503 Rémy Sigrist, <a href="/A338503/b338503.txt">Table of n, a(n) for n = 1..10000</a> %H A338503 Rémy Sigrist, <a href="/A338503/a338503.gp.txt">PARI program for A338503</a> %e A338503 For n = 3: %e A338503 - A338502(1) AND A338502(2) AND A338502(3) = 0 AND 1 AND 5 = 4 = 2^2, %e A338503 - so a(3) = 2. %o A338503 (PARI) See Links section. %Y A338503 Cf. A292389, A338502. %K A338503 nonn,base %O A338503 1,3 %A A338503 _Rémy Sigrist_, Oct 31 2020