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 A032966 #12 Feb 12 2021 22:37:36
%S A032966 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,34,36,
%T A032966 38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,
%U A032966 84,86,88,90,92,94,96,98,100,102,104,106,108
%N A032966 Numbers whose base-16 representation Sum_{i=0..m} d(i)*16^(m-i) has even d(i) for all odd i.
%K A032966 nonn,base
%O A032966 1,2
%A A032966 _Clark Kimberling_
%E A032966 Definition corrected by _Sean A. Irvine_, Nov 17 2020