A133053 - OEIS

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A133053 as a simple table

n	a(n)
0	1
1	1
2	4
3	16
4	81
5	441
6	2601
7	16129
8	104329
9	697225
10	4787344
11	33616804
12	240591121
13	1750167225
14	12912685956
15	96454967184
16	728405920089
17	5554407254841
18	42724289649924
19	331213938112656

[1,1,4,16,81,441,2601,16129,104329,697225,4787344, 33616804,240591121,1750167225,12912685956, 96454967184,728405920089,5554407254841, 42724289649924,331213938112656]