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 A280884 #4 Jan 12 2017 15:15:03 %S A280884 1,21,56,1386,252,18942,28512,837837,122122,17600583,1445808, %T A280884 140411908,301302288,10781435088,79318464,333208994139,6813685494, %U A280884 597189699029,582524800704,89346032143830,3151550453480,1467268659100530,1095411461933880,45383787697612455 %N A280884 Number of set partitions of [n] into exactly six blocks where sizes of distinct blocks are coprime. %H A280884 Wikipedia, <a href="https://en.wikipedia.org/wiki/Coprime_integers">Coprime integers</a> %H A280884 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %Y A280884 Column k=6 of A280880. %K A280884 nonn %O A280884 6,2 %A A280884 _Alois P. Heinz_, Jan 09 2017