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 A048300 #6 Oct 13 2019 16:44:22 %S A048300 0,1,2,4,8,9,13,17,18,22,26,27,40,53,54,67,80,81,108,121,134,161,162, %T A048300 202,216,229,242,243,256,269,324,364,404,459,472,485,486,499,512,594, %U A048300 607,620,648,688,728,729,769,809,972,1053,1093,1133,1214,1377,1417 %N A048300 Numbers whose base-3 expansions, read from left to right, have run lengths that strictly increase. %Y A048300 Cf. A037015, A043692, A043706, A044814, A044952. %K A048300 nonn,base %O A048300 0,3 %A A048300 _Patrick De Geest_, Feb 15 1999