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A199228
as a simple table
n
a(n)
1
15
2
1538
3
108608
4
9196334
5
792389959
6
70698654245
7
6443389324257
8
597038658964877
9
56047378745263409
[15,1538,108608,9196334,792389959,70698654245, 6443389324257,597038658964877,56047378745263409]