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A195894
as a simple table
n
a(n)
1
591
2
90013
3
4857647
4
65530899
5
584257875
6
3204150229
7
15120998539
8
54574236425
9
172034293523
10
489664849531
[591,90013,4857647,65530899,584257875,3204150229, 15120998539,54574236425,172034293523,489664849531]