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 A048309 #6 Oct 13 2019 16:40:25 %S A048309 0,1,2,3,4,5,6,7,8,9,10,11,13,26,39,52,65,78,91,104,117,130,143,144, %T A048309 157,170,183,196,209,222,235,248,261,274,287,288,301,314,327,340,353, %U A048309 366,379,392,405,418,431,432,445,458,471,484,497,510,523,536,549,562 %N A048309 Numbers whose base-12 expansions, read from left to right, have run lengths that strictly increase. %Y A048309 Cf. A037015, A043701, A043715, A044823, A044961. %K A048309 nonn,base %O A048309 0,3 %A A048309 _Patrick De Geest_, Feb 15 1999