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A161581 as a simple table

n a(n)
3 21
4 231
5 3003
6 43758
7 692835
8 11685817
9 207157665
10 3823000545
11 72931087320
12 1430571328200
13 28734046963560
14 589047962752980
15 12292044987448215
16 260543149635912165
17 5599392250947235125
18 121830987186399315825

[21,231,3003,43758,692835,11685817,207157665,
 3823000545,72931087320,1430571328200,
 28734046963560,589047962752980,12292044987448215,
 260543149635912165,5599392250947235125,
 121830987186399315825]

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Last modified October 15 22:50 EDT 2018. Contains 316252 sequences. (Running on oeis4.)