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A183387
as a simple table
n
a(n)
1
1
2
1
3
1
4
4
5
21
6
148
7
2376
8
48868
9
1730057
10
102043638
11
9184967738
12
1385925975119
[1,1,1,4,21,148,2376,48868,1730057,102043638, 9184967738,1385925975119]