A270765 - OEIS

%I #5 Mar 22 2016 18:12:05

%S 1,4,16,67,299,1429,7307,39848,230884,1416047,9160977,62316137,

%T 444424965,3314372728,25786012724,208842481687,1757367578867,

%U 15337268316933,138603393210479,1295082562497364,12494759080718152,124314054484739035,1274003246005735449

%N Total sum of the sizes of all blocks with minimal element 2 in all set partitions of {1,2,...,n}.

%H Alois P. Heinz, <a href="/A270765/b270765.txt">Table of n, a(n) for n = 2..575</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>

%Y Column k=2 of A270702.

%Y A diagonal of A270701.

%K nonn

%O 2,2

%A _Alois P. Heinz_, Mar 22 2016