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 A036919 #5 Jul 08 2025 21:58:00 %S A036919 0,1,5,24,130,815,5871,47950,438404,4438845,49320505,596778116, %T A036919 7812368070,110024183659,1658826153635,26659706040570,454992316425736, %U A036919 8218298715439865,156631104929559789,3141323826642838000 %N A036919 A036918/2. %K A036919 nonn %O A036919 0,3 %A A036919 _N. J. A. Sloane_