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 A044836 #20 Nov 08 2020 23:06:41
%S A044836 11,22,33,44,55,66,77,88,99,1100,1111,1122,1133,1144,1155,1166,1177,
%T A044836 1188,1199,2200,2211,2222,2233,2244,2255,2266,2277,2288,2299,3300,
%U A044836 3311,3322,3333,3344,3355,3366,3377,3388,3399,4400
%N A044836 Positive integers having more base-10 runs of even length than odd.
%H A044836 Rémy Sigrist, <a href="/A044836/b044836.txt">Table of n, a(n) for n = 1..10000</a>
%o A044836 (PARI) is(n,base=10) = { my (v=0); while (n, my (d=n%base, w=0); while (n%base==d, n\=base; w++); v+=(-1)^w); v>0 } \\ _Rémy Sigrist_, Nov 07 2020
%Y A044836 Number of even/odd runs: A044941, A044950. Cf. A044851 (no fewer), A044866 (same number).
%Y A044836 Cf. A044828 (binary analog), A338754.
%K A044836 nonn,base
%O A044836 1,1
%A A044836 _Clark Kimberling_
%E A044836 Incorrect formula removed by _Rémy Sigrist_, Nov 07 2020