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 A280883 #4 Jan 12 2017 15:09:12 %S A280883 1,15,35,630,126,6930,9570,202455,35035,3612609,361725,25350780, %T A280883 50620220,1262865060,15864468,33652405845,942571665,68217941715, %U A280883 72924794635,7281932609490,364040548850,111203641740750,79780936522950,2097251547484275,471615091340211 %N A280883 Number of set partitions of [n] into exactly five blocks where sizes of distinct blocks are coprime. %H A280883 Wikipedia, <a href="https://en.wikipedia.org/wiki/Coprime_integers">Coprime integers</a> %H A280883 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %Y A280883 Column k=5 of A280880. %K A280883 nonn %O A280883 5,2 %A A280883 _Alois P. Heinz_, Jan 09 2017