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 A255954 #4 Mar 11 2015 19:38:13 %S A255954 0,7,127,1518,15800,154410,1470702,13921922,132465058,1275540777, %T A255954 12482994680,124488408308,1267192059423,13179257452283, %U A255954 140124528853582,1523425278785190,16936782395913056,192530701636263004,2237390160167413881,26572938927762778750 %N A255954 Number of collections of nonempty multisets with a total of n+4 objects of exactly n colors. %H A255954 Alois P. Heinz, <a href="/A255954/b255954.txt">Table of n, a(n) for n = 0..250</a> %F A255954 a(n) = A255903(n+4,n), %Y A255954 A diagonal of A255903. %K A255954 nonn %O A255954 0,2 %A A255954 _Alois P. Heinz_, Mar 11 2015