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 A320558 #6 Oct 17 2018 17:31:50 %S A320558 877,5852,27267,110545,422396,1578192,5877165,22355618,87597223, %T A320558 345223398,1352883364,5249340393,20158426185,76729396494,290259302392, %U A320558 1094289866107,4121529511428,15518374075986,58402401729381,219602989556557,824720185307142,3092742982300231 %N A320558 Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most eight elements and for at least one block c the smallest integer interval containing c has exactly eight elements. %H A320558 Alois P. Heinz, <a href="/A320558/b320558.txt">Table of n, a(n) for n = 8..1000</a> %F A320558 a(n) = A276724(n) - A276723(n). %p A320558 b:= proc(n, m, l) option remember; `if`(n=0, 1, %p A320558 add(b(n-1, max(m, j), [subsop(1=NULL, l)[], %p A320558 `if`(j<=m, 0, j)]), j={l[], m+1} minus {0})) %p A320558 end: %p A320558 A:= (n, k)-> `if`(n=0, 1, `if`(k<2, k, b(n, 0, [0$(k-1)]))): %p A320558 a:= n-> (k-> A(n, k) -`if`(k=0, 0, A(n, k-1)))(8): %p A320558 seq(a(n), n=8..50); %Y A320558 Column k=8 of A276727. %Y A320558 Cf. A276723, A276724, A320621. %K A320558 nonn,easy %O A320558 8,1 %A A320558 _Alois P. Heinz_, Oct 15 2018