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 A032611 #12 Feb 17 2024 10:29:33
%S A032611 17,28,39,410,511,612,713,814,915,1016,1117,1218,1319,1420,1521,1622,
%T A032611 1723,1824,1925,2026,2127,2228,2329,2430,2531,2632,2733,2834,2935,
%U A032611 3036,3137,3238,3339,3440,3541,3642,3743,3844,3945,4046,4147,4248
%N A032611 Concatenation of n and n + 6 or {n,n+6}.
%Y A032611 Cf. A001704, A020338.
%K A032611 nonn,base
%O A032611 1,1
%A A032611 _Patrick De Geest_, May 15 1998