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 A228618 #12 Sep 06 2014 09:28:25
%S A228618 0,1,6,33,280,3185,46956,824593,16782872,387446193,10000154620,
%T A228618 285312472621,8916105651300,302875136889793,11112007033351602,
%U A228618 437893891702463085,18446744083262649616,827240261951698484129,39346408075791905146044,1978419655663922695962061
%N A228618 Sum of lengths of shortest runs with the same value over all s in {1,...,n}^n.
%H A228618 Alois P. Heinz, <a href="/A228618/b228618.txt">Table of n, a(n) for n = 0..140</a>
%F A228618 a(n) = Sum_{k=0..n} k*A228617(n,k).
%F A228618 a(n) ~ n^n. - _Vaclav Kotesovec_, Sep 06 2014
%e A228618 a(3) = 33 = 3 + 12*1 + 3 + 12*1 + 3: [1,1,1], [1,1,2], [1,1,3], [1,2,1], [1,2,2], [1,2,3], [1,3,1], [1,3,2], [1,3,3], [2,1,1], [2,1,2], [2,1,3], [2,2,1], [2,2,2], [2,2,3], [2,3,1], [2,3,2], [2,3,3], [3,1,1], [3,1,2], [3,1,3], [3,2,1], [3,2,2], [3,2,3], [3,3,1], [3,3,2], [3,3,3].
%Y A228618 Cf. A228194.
%K A228618 nonn
%O A228618 0,3
%A A228618 _Alois P. Heinz_, Aug 27 2013