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A089539 as a simple table

n a(n)
1 4
2 4
3 9
4 25
5 121
6 721
7 5041
8 40321
9 362885
10 3628801
11 39916803
12 479001617
13 6227020801
14 87178291201
15 1307674368007
16 20922789888002
17 355687428096003
18 6402373705728023
19 121645100408832001
20 2432902008176640001

[4,4,9,25,121,721,5041,40321,362885,3628801,
 39916803,479001617,6227020801,87178291201,
 1307674368007,20922789888002,355687428096003,
 6402373705728023,121645100408832001,
 2432902008176640001]

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Last modified January 22 09:52 EST 2019. Contains 319363 sequences. (Running on oeis4.)