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 A333556 #9 Mar 28 2020 17:51:22 %S A333556 1,3,7,15,10,26,58,43,107,121,92,220,207,232,160,134,152,408,396,430, %T A333556 492,262,774,784,825,862,1008,754,718,546,1570,1589,1650,1600,1867, %U A333556 1875,2042,1524,1419,1174,3222,3210,3237,3102,3163,3361,3882,3642,2589,2930 %N A333556 a(n) = A333555(1) XOR ... XOR A333555(n) (where XOR denotes the bitwise XOR operator). %C A333556 All terms are distinct. %H A333556 Rémy Sigrist, <a href="/A333556/b333556.txt">Table of n, a(n) for n = 1..8747</a> %H A333556 Rémy Sigrist, <a href="/A333556/a333556.txt">C program for A333556</a> %e A333556 a(3) = A333555(1) XOR A333555(2) XOR A333555(3) = 1 XOR 2 XOR 4 = 7. %o A333556 (C) See Links section. %Y A333556 Cf. A333555. %K A333556 nonn,look,base %O A333556 1,2 %A A333556 _Rémy Sigrist_, Mar 26 2020