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Total sum of the sizes of all blocks with minimal element 4 in all set partitions of {1,2,...,n}.
3

%I #5 Mar 22 2016 18:31:35

%S 5,25,127,670,3702,21485,131007,838485,5624233,39465366,289162042,

%T 2208190845,17544083557,144774580209,1238893540107,10977721223490,

%U 100583317230394,951731543130505,9288688865151775,93402218357061709,966643007728282629,10286173737875876050

%N Total sum of the sizes of all blocks with minimal element 4 in all set partitions of {1,2,...,n}.

%H Alois P. Heinz, <a href="/A270767/b270767.txt">Table of n, a(n) for n = 4..575</a>

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

%Y Column k=4 of A270702.

%Y A diagonal of A270701.

%K nonn

%O 4,1

%A _Alois P. Heinz_, Mar 22 2016