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 A048451 #6 Oct 14 2019 23:43:24 %S A048451 30,56,97,125,179,214,274,326,382,454,506,582,640,708,780,842,924,984, %T A048451 1060,1128,1194,1276,1348,1432,1508,1582,1652,1718,1808,1870,1998, %U A048451 2052,2192,2238,2364,2418,2522,2594,2686,2758,2860,2912,3028,3074,3196,3268 %N A048451 Starting from generation 4 add previous and next term yielding generation 5. %Y A048451 Generation 4 is A048450. See A048448-A048466. See also A047844. %K A048451 nonn %O A048451 0,1 %A A048451 _Patrick De Geest_, May 15 1999