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 A191744 #17 Mar 30 2012 17:36:33
%S A191744 24,1152,110592,5308416,995328000
%N A191744 Number of Hamiltonian cycles in the 5-ary De Bruijn graph.
%C A191744 The 5-ary De Bruijn graph is the graph with 5*n nodes {0..5*n-1} and edges from each i to 5*i + j (mod 5*n), for 0<=j<5.
%Y A191744 Cf. A027362 (2-ary graph), A192513 (3-ary graph).
%K A191744 nonn,hard,more
%O A191744 1,1
%A A191744 _Joerg Arndt_, Jul 03 2011