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 A255953 #5 Mar 11 2015 19:38:42
%S A255953 0,5,56,492,3936,30710,240012,1904301,15446672,128576019,1100414420,
%T A255953 9692024727,87872444424,820015945853,7873581959208,77748058644050,
%U A255953 789084769234176,8226289694091564,88033961164032132,966450255695509761,10877046448539404200
%N A255953 Number of collections of nonempty multisets with a total of n+3 objects of exactly n colors.
%H A255953 Alois P. Heinz, <a href="/A255953/b255953.txt">Table of n, a(n) for n = 0..250</a>
%F A255953 a(n) = A255903(n+3,n).
%e A255953 a(1) = 5: {{1},{1},{1},{1}}, {{1},{1},{1,1}}, {{1,1},{1,1}}, {{1},{1,1,1}}, {{1,1,1,1}}.
%Y A255953 A diagonal of A255903.
%K A255953 nonn
%O A255953 0,2
%A A255953 _Alois P. Heinz_, Mar 11 2015