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%I #8 Aug 02 2016 08:05:27
%S 1,70,4005,219521,11954993,653625597,35989579051,1997232863281,
%T 111698425867139,6292920483661649,356957345427055439,
%U 20375264103726231304,1169732275950521805077,67508137728429209948117,3914904903283946200635048,228039200549822180269793411
%N Number of set partitions of [2n] with symmetric block size list of length eight.
%H Alois P. Heinz, <a href="/A275295/b275295.txt">Table of n, a(n) for n = 4..300</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>
%F a(n) ~ 64^n / (20160*Pi^2*n^2). - _Vaclav Kotesovec_, Aug 02 2016
%e a(4) = 1: 1|2|3|4|5|6|7|8.
%Y Bisection of column k=8 of A275281.
%K nonn
%O 4,2
%A _Alois P. Heinz_, Jul 22 2016