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 A271752 #8 Apr 13 2016 14:39:53 %S A271752 0,1,4,15,59,250,1145,5649,29874,168509,1009215,6391484,42648083, %T A271752 298865333,2193219124,16811408659,134289313167,1115559002906, %U A271752 9619253991637,85950089855573,794567157607386,7588822028424393,74783864494826723,759461721024357540 %N A271752 Number of set partitions of [n+1] such that n is the largest element of the last block. %H A271752 Alois P. Heinz, <a href="/A271752/b271752.txt">Table of n, a(n) for n = 1..576</a> %H A271752 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %F A271752 a(n) = A271466(n+1,n). %e A271752 a(3) = 4: 124|3, 14|23, 14|2|3, 1|24|3. %e A271752 a(4) = 15: 1235|4, 125|34, 125|3|4, 12|35|4, 135|24, 135|2|4, 13|25|4, 15|234, 15|23|4, 1|235|4, 15|2|34, 1|25|34, 15|2|3|4, 1|25|3|4, 1|2|35|4. %Y A271752 A diagonal of A271466. %K A271752 nonn %O A271752 1,3 %A A271752 _Alois P. Heinz_, Apr 13 2016