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 A255952 #4 Mar 11 2015 19:39:05 %S A255952 0,3,23,141,848,5190,32835,216006,1480524,10574613,78652940,608539283, %T A255952 4891327374,40788987473,352412667201,3150522213345,29106469066976, %U A255952 277557448176080,2728859399410797,27631899836521084,287875667322386270,3082851976122478749 %N A255952 Number of collections of nonempty multisets with a total of n+2 objects of exactly n colors. %H A255952 Alois P. Heinz, <a href="/A255952/b255952.txt">Table of n, a(n) for n = 0..250</a> %F A255952 a(n) = A255903(n+2,n). %Y A255952 A diagonal of A255903. %K A255952 nonn %O A255952 0,2 %A A255952 _Alois P. Heinz_, Mar 11 2015