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 A287255 #6 May 22 2017 11:49:14 %S A287255 1,1,2,5,15,52,203,876,4104,20666,111075,633704,3819875,24230302, %T A287255 161175189,1120918549,8129696204,61351621492,480802257296, %U A287255 3905922860317,32839970931663,285348575175351,2559007785431183,23657489230231038,225209876301752325 %N A287255 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= five. %H A287255 Alois P. Heinz, <a href="/A287255/b287255.txt">Table of n, a(n) for n = 0..582</a> %H A287255 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %F A287255 a(n) = A287216(n,5). %F A287255 a(n) = A000110(n) for n <= 6. %Y A287255 Column k=5 of A287216. %Y A287255 Cf. A000110. %K A287255 nonn %O A287255 0,3 %A A287255 _Alois P. Heinz_, May 22 2017