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A171289
as a simple table
n
a(n)
1
15
2
225
3
3360
4
49986
5
747245
6
11142675
7
165997846
8
2475696187
9
36893238627
10
549715326612
[15,225,3360,49986,747245,11142675,165997846, 2475696187,36893238627,549715326612]