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 A048454 #10 Jun 17 2021 09:11:30 %S A048454 237,530,757,1132,1399,1838,2199,2653,3136,3578,4142,4600,5166,5690, %T A048454 6216,6812,7314,7926,8454,9034,9628,10194,10834,11414,12036,12636, %U A048454 13202,13886,14398,15262,15722,16742,17158,18188,18614,19536,20032,20848 %N A048454 Starting from generation 7 add previous and next term yielding generation 8. %Y A048454 Generation 7 is A048453. See A048448-A048466. See also A047844. %K A048454 nonn %O A048454 0,1 %A A048454 _Patrick De Geest_, May 15 1999 %E A048454 Missing a(5) inserted by _Sean A. Irvine_, Jun 16 2021