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%I #4 May 09 2017 19:03:22
%S 1,6,25,98,399,1746,8271,42284,231939,1357128,8427181,55288860,
%T 381798629,2765917074,20960284277,165729739590,1364153612299,
%U 11665484410094,103448316470723,949739632313480,9013431476894623,88304011710168668,891917738589610553
%N Number of entries in the second last blocks of all set partitions of [n].
%H Alois P. Heinz, <a href="/A286433/b286433.txt">Table of n, a(n) for n = 2..250</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>
%e a(3) = 6 because the number of entries in the second last blocks of all set partitions of [3] (123, 12|3, 13|2, 1|23, 1|2|3) is 0+2+2+1+1 = 6.
%Y Column k=2 of A286416.
%K nonn
%O 2,2
%A _Alois P. Heinz_, May 09 2017
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