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 A048450 #6 Oct 14 2019 23:43:36 %S A048450 13,30,43,67,82,112,132,162,194,220,260,286,322,354,386,426,456,498, %T A048450 528,562,600,632,676,716,756,792,826,860,892,948,978,1050,1074,1142, %U A048450 1164,1222,1254,1300,1340,1386,1418,1474,1494,1554,1580,1642,1688,1744 %N A048450 Starting from generation 3 add previous and next term yielding generation 4. %Y A048450 Generation 3 is A048449. See A048448-A048466. See also A047844. %K A048450 nonn %O A048450 0,1 %A A048450 _Patrick De Geest_, May 15 1999