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 A032859 #25 Sep 18 2022 19:41:05
%S A032859 0,1,2,3,4,8,9,12,13,14,17,18,19,33,34,35,38,39,49,50,51,54,55,59,68,
%T A032859 72,73,76,77,78,132,136,137,140,141,142,152,153,156,157,158,196,200,
%U A032859 201,204,205,206,216,217,220,221,222,236,237,238
%N A032859 Numbers whose base-4 representation Sum_{i=0..m} d(i)*4^i has d(m) > d(m-1) < d(m-2) > ...
%H A032859 Harvey P. Dale, <a href="/A032859/b032859.txt">Table of n, a(n) for n = 1..1000</a>
%t A032859 Join[{0},Select[Range[250],(Sign/@Differences[IntegerDigits[#,4]]) == PadRight[ {},IntegerLength[#,4]-1,{-1,1}]&]] (* _Harvey P. Dale_, Sep 18 2022 *)
%Y A032859 Cf. A007090, A306106.
%Y A032859 Cf. A032858..A032865 for bases 3..10.
%Y A032859 Cf. A306106..A306111 and A297147 for bases 3..9 and 10.
%K A032859 nonn,base
%O A032859 1,3
%A A032859 _Clark Kimberling_
%E A032859 a(1)=0 inserted by _Georg Fischer_, Dec 18 2020