A158952 - OEIS

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A158952 as a simple table

n	a(n)
1	1
2	2
3	9
4	67
5	625
6	7903
7	117649
8	2105342
9	43048905
10	1000976352
11	25937424601
12	743191207969
13	23298085122481
14	793763217701693
15	29192928060852217
16	1152939097060278256
17	48661191875666868481
18	2185919903971766191000

[1,2,9,67,625,7903,117649,2105342,43048905, 1000976352,25937424601,743191207969, 23298085122481,793763217701693,29192928060852217, 1152939097060278256,48661191875666868481, 2185919903971766191000]