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 A044815 #15 Jan 04 2021 18:18:38 %S A044815 1,2,3,5,10,15,16,20,21,22,23,26,31,32,37,40,41,42,43,47,48,53,58,60, %T A044815 61,62,63,64,84,85,86,87,106,127,128,149,168,169,170,171,191,192,213, %U A044815 234,252,253,254,255,256,320,336,340,341,342,343,346,351,362,383,426,511 %N A044815 Positive integers having distinct base-4 run lengths. %H A044815 David A. Corneth, <a href="/A044815/b044815.txt">Table of n, a(n) for n = 1..10000</a> %e A044815 31 = 133_4 is in the sequence as it has distinct run lengths of same digits (1, 2). - _David A. Corneth_, Jan 04 2021 %Y A044815 Cf. A044813, A044814, A044815, A044816, A044817, A044818, A044819, A044820, A044821, A044822, A044823, A044824, A044825, A044826, A044827 (base 2 to base 16). %K A044815 nonn,base %O A044815 1,2 %A A044815 _Clark Kimberling_