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 A287257 #6 May 22 2017 11:54:09 %S A287257 1,1,2,5,15,52,203,877,4140,21146,115843,675473,4168497,27104931, %T A287257 185021744,1321754226,9855001715,76507188271,617104691644, %U A287257 5161680552010,44693782407111,399989835781046,3694733749868820,35179653387299934,344876641013083336 %N A287257 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= seven. %H A287257 Alois P. Heinz, <a href="/A287257/b287257.txt">Table of n, a(n) for n = 0..580</a> %H A287257 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %F A287257 a(n) = A287216(n,7). %F A287257 a(n) = A000110(n) for n <= 8. %Y A287257 Column k=7 of A287216. %Y A287257 Cf. A000110. %K A287257 nonn %O A287257 0,3 %A A287257 _Alois P. Heinz_, May 22 2017