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The On-Line Encyclopedia of Integer Sequences
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A181381
as a simple table
n
a(n)
1
1
2
21
3
293
4
3842
5
38076
6
282579
7
1736822
8
8938227
9
33956667
[1,21,293,3842,38076,282579,1736822,8938227, 33956667]