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A167999
as a simple table
n
a(n)
1
1
2
3
3
10
4
46
5
264
6
1773
7
13719
8
120770
9
1190358
10
12961563
11
154466259
12
2000471830
13
27980585221
[1,3,10,46,264,1773,13719,120770,1190358,12961563, 154466259,2000471830,27980585221]