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 A032613 #12 Feb 17 2024 10:29:26
%S A032613 19,210,311,412,513,614,715,816,917,1018,1119,1220,1321,1422,1523,
%T A032613 1624,1725,1826,1927,2028,2129,2230,2331,2432,2533,2634,2735,2836,
%U A032613 2937,3038,3139,3240,3341,3442,3543,3644,3745,3846,3947,4048,4149
%N A032613 Concatenation of n and n + 8 or {n,n+8}.
%Y A032613 Cf. A001704, A020338.
%K A032613 nonn,base
%O A032613 1,1
%A A032613 _Patrick De Geest_, May 15 1998