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 A055951 #12 Aug 08 2024 06:38:58
%S A055951 0,0,0,0,0,4,0,-4,-8,-12,8,4,0,-4,-8,12,8,4,0,-4,16,12,8,4,0,24,0,-24,
%T A055951 -48,-72,24,0,-24,-48,-72,24,0,-24,-48,-72,24,0,-24,-48,-72,24,0,-24,
%U A055951 -48,-72,48,24,0,-24,-48,48,24,0,-24,-48,48,24,0,-24,-48,48,24,0,-24,-48,48,24,0,-24,-48,72,48,24,0,-24,72,48,24,0
%N A055951 n - reversal of base 5 digits of n (written in base 10).
%C A055951 a(n) is a multiple of 4.
%H A055951 Paolo Xausa, <a href="/A055951/b055951.txt">Table of n, a(n) for n = 0..10000</a>
%F A055951 a(n) = n - A030104(n).
%t A055951 Table[n - IntegerReverse[n, 5], {n, 0, 100}] (* _Paolo Xausa_, Aug 08 2024 *)
%Y A055951 Cf. A030104, A056965.
%K A055951 base,sign
%O A055951 0,6
%A A055951 _Henry Bottomley_, Jul 18 2000