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 A287256 #6 May 22 2017 11:53:40 %S A287256 1,1,2,5,15,52,203,877,4139,21079,114784,664100,4062241,26164323, %T A287256 176828713,1250185783,9221588229,70796614497,564525137134, %U A287256 4666694339977,39927027760582,353023213637306,3221255985418911,30296436876469140,293363448567612910 %N A287256 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= six. %H A287256 Alois P. Heinz, <a href="/A287256/b287256.txt">Table of n, a(n) for n = 0..581</a> %H A287256 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %F A287256 a(n) = A287216(n,6). %F A287256 a(n) = A000110(n) for n <= 7. %Y A287256 Column k=6 of A287216. %Y A287256 Cf. A000110. %K A287256 nonn %O A287256 0,3 %A A287256 _Alois P. Heinz_, May 22 2017