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 A048452 #6 Oct 14 2019 23:43:12 %S A048452 56,127,181,276,339,453,540,656,780,888,1036,1146,1290,1420,1550,1704, %T A048452 1826,1984,2112,2254,2404,2542,2708,2856,3014,3160,3300,3460,3588, %U A048452 3806,3922,4190,4290,4556,4656,4886,5012,5208,5352,5546,5670,5888,5986,6224 %N A048452 Starting from generation 5 add previous and next term yielding generation 6. %Y A048452 Generation 5 is A048451. See A048448-A048466. See also A047844. %K A048452 nonn %O A048452 0,1 %A A048452 _Patrick De Geest_, May 15 1999