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 A098497 #5 Jun 07 2023 20:06:30 %S A098497 1,-1,1,-7,76,-989,15289,-275807,5702887,-133121449,3464398070, %T A098497 -99482086439,3125039826481,-106610733533317,3925411300203301, %U A098497 -155161278879431551,6553471162481684656 %N A098497 Main diagonal of triangle A098495. %Y A098497 Cf. A098495. %K A098497 sign %O A098497 0,4 %A A098497 _Ralf Stephan_, Sep 12 2004