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 A368360 #13 Jan 16 2024 16:14:38
%S A368360 2,24,46,68,81,1,21,41,61,82,2,22,42,62,83,3,23,43,63,84,4,24,44,64,
%T A368360 85,5,25,45,65,86,6,26,46,66,87,7,27,47,67,88,8,28,48,68,89,9,29,49,
%U A368360 69,81,1,21,41,61,81,1,21,41,61,81,1,21,41,61,81,1,21,41,61,81,1,21,41,61,81,1,21,41,61,81,1,21,41,61,81,1,21,41,61
%N A368360 Comma transform of the even numbers.
%C A368360 See A367360 for further information.
%H A368360 Alois P. Heinz, <a href="/A368360/b368360.txt">Table of n, a(n) for n = 0..10000</a>
%p A368360 a:= n-> parse(cat(""||(2*n)[-1], ""||(2*n+2)[1])):
%p A368360 seq(a(n), n=0..88); # _Alois P. Heinz_, Jan 03 2024
%o A368360 (Python)
%o A368360 def A368360(n): return (0,20,40,60,80)[n%5]+int(str(n+1<<1)[0]) # _Chai Wah Wu_, Jan 03 2024
%Y A368360 Cf. A005843, A367360.
%K A368360 nonn,base
%O A368360 0,1
%A A368360 _N. J. A. Sloane_, Jan 02 2024