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A208812
as a simple table
n
a(n)
1
1
2
4
3
29
4
236
5
2095
6
20409
7
209793
8
2220143
9
23933783
10
264637987
11
2967244283
12
33695174581
13
387241027611
[1,4,29,236,2095,20409,209793,2220143,23933783, 264637987,2967244283,33695174581,387241027611]