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 A063399 #6 Apr 23 2023 22:35:38 %S A063399 1,1,7,115,3205,138345,8543519,714313647,77657039081,10644520988729, %T A063399 1795436642957911,365404877299993475,88285106031863804877, %U A063399 24979640229199673829201,8181329846390271384540511,3070780080199883964109428031,1309389328134899673857450461905 %N A063399 Main diagonal of arrays A063180 and A063181. %K A063399 easy,nonn %O A063399 1,3 %A A063399 _Floor van Lamoen_, Jul 16 2001 %E A063399 Offset corrected and more terms from _Sean A. Irvine_, Apr 23 2023