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A146469
as a simple table
n
a(n)
1
1
2
1
3
1
4
13
5
69
6
457
7
6223
8
127787
9
3658281
10
163817453
11
11238713859
12
1160267254915
13
182817418500667
[1,1,1,13,69,457,6223,127787,3658281,163817453, 11238713859,1160267254915,182817418500667]