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A171293
as a simple table
n
a(n)
1
19
2
361
3
6840
4
129254
5
2450222
6
46379533
7
877297399
8
16607578689
9
314206446033
[19,361,6840,129254,2450222,46379533,877297399, 16607578689,314206446033]