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A038181
as a simple table
n
a(n)
1
1
2
2
3
6
4
35
5
251
6
2602
7
30900
8
400818
9
5401599
10
74617105
11
1047497078
12
14888851869
[1,2,6,35,251,2602,30900,400818,5401599,74617105, 1047497078,14888851869]
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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)