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 A228631 #5 Aug 28 2013 08:47:31
%S A228631 5,0,0,0,0,90,220,264,312,364,3360,11280,26656,47430,74556,246240,
%T A228631 824040,2242086,5166260,10272168,26698800,81381300,233188956,
%U A228631 593255880,1353111928,3416572650,9872919060,28825911968,78295457856,194146795920,496358103500
%N A228631 Number of s in {1,...,n}^n having shortest run with the same value of length 5.
%H A228631 Alois P. Heinz, <a href="/A228631/b228631.txt">Table of n, a(n) for n = 5..180</a>
%e A228631 a(5) = 5: [1,1,1,1,1], [2,2,2,2,2], [3,3,3,3,3], [4,4,4,4,4], [5,5,5,5,5].
%e A228631 a(10) = 2*C(10,2) = 90: [1,1,1,1,1,2,2,2,2,2], ..., [10,10,10,10,10,9,9,9,9,9].
%Y A228631 Column k=5 of A228617.
%K A228631 nonn
%O A228631 5,1
%A A228631 _Alois P. Heinz_, Aug 28 2013