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 A341499 #5 Feb 21 2021 10:40:04 %S A341499 3,30,1566,284112,122330880,112777827840,196166156901120, %T A341499 593448176589649920,2927894041560795955200,22384255485528968471838720, %U A341499 254368264421726727280223846400,4150617533254451866274537825894400,94460232869419006706028435289512345600 %N A341499 Number of Hamiltonian cycles in the 4 X n rook graph. %Y A341499 Column 4 of A269562. %K A341499 nonn %O A341499 1,1 %A A341499 _Andrew Howroyd_, Feb 21 2021