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 A275294 #10 Aug 02 2016 08:04:23 %S A275294 1,34,1035,31346,958708,29677572,929442097,29416786597,939795181248, %T A275294 30273240306244,982317847204631,32081167538512119,1053762976292882820, %U A275294 34790825470327029730,1153951843926244071285,38433994194836318210579,1284926817226752232868308 %N A275294 Number of set partitions of [2n] with symmetric block size list of length six. %H A275294 Alois P. Heinz, <a href="/A275294/b275294.txt">Table of n, a(n) for n = 3..300</a> %H A275294 Vaclav Kotesovec, <a href="/A275294/a275294.txt">Recurrence (of order 5)</a> %H A275294 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a> %F A275294 a(n) ~ 2^(2*n - 6) * 3^(2*n - 1/2) / (5*Pi^(3/2)*n^(3/2)). - _Vaclav Kotesovec_, Aug 02 2016 %e A275294 a(3) = 1: 1|2|3|4|5|6. %e A275294 a(4) = 34: 12|3|4|5|6|78, 13|2|4|5|6|78, 1|23|4|5|67|8, 1|23|4|5|68|7, 14|2|3|5|6|78, 1|24|3|5|67|8, 1|24|3|5|68|7, 1|2|34|56|7|8, 1|2|34|57|6|8, 1|2|34|58|6|7, 15|2|3|4|6|78, 1|25|3|4|67|8, 1|25|3|4|68|7, 1|2|35|46|7|8, 1|2|35|47|6|8, 1|2|35|48|6|7, 1|2|36|45|7|8, 1|2|37|45|6|8, 1|2|38|45|6|7, 16|2|3|4|5|78, 1|26|3|4|57|8, 1|26|3|4|58|7, 1|2|36|47|5|8, 1|2|36|48|5|7, 1|2|37|46|5|8, 1|2|38|46|5|7, 1|27|3|4|56|8, 1|28|3|4|56|7, 17|2|3|4|5|68, 1|27|3|4|58|6, 1|2|37|48|5|6, 1|2|38|47|5|6, 1|28|3|4|57|6, 18|2|3|4|5|67. %Y A275294 Bisection of column k=6 of A275281. %K A275294 nonn %O A275294 3,2 %A A275294 _Alois P. Heinz_, Jul 22 2016