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A101613
(2n)! * Sum[k=n..2n, 1/k].
5
3, 26, 684, 35664, 3068640, 392722560, 69878833920, 16484477184000, 4976250951168000, 1870345490614272000, 856314330237628416000, 469109144339151224832000, 302956190548293037916160000
OFFSET
1,1
KEYWORD
nonn,easy
AUTHOR
Ralf Stephan, Dec 10 2004
STATUS
approved