A087374 - OEIS

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A087374 as a simple table

n	a(n)
1	1
2	4
3	9
4	25
5	121
6	729
7	5041
8	40401
9	363609
10	3629025
11	39917124
12	479040769
13	6227103744
14	87178467600
15	1307674583296
16	20922793332736
17	355687454263684
18	6402373820077225
19	121645100663836929
20	2432902009335560361

[1,4,9,25,121,729,5041,40401,363609,3629025, 39917124,479040769,6227103744,87178467600, 1307674583296,20922793332736,355687454263684, 6402373820077225,121645100663836929, 2432902009335560361]