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A220582
as a simple table
n
a(n)
1
1
2
128
3
375
4
17505
5
165130
6
2652007
7
33180533
8
450926562
9
5905274893
10
77665021467
[1,128,375,17505,165130,2652007,33180533, 450926562,5905274893,77665021467]