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A033296 as a simple table

n a(n)
1 1
2 6
3 42
4 326
5 2706
6 23526
7 211546
8 1951494
9 18366882
10 175674054
11 1702686090
12 16686795846
13 165079509042
14 1646340228006
15 16534463822010
16 167081444125702
17 1697551974416706
18 17330661859937670
19 177699201786231530

[1,6,42,326,2706,23526,211546,1951494,18366882,
 175674054,1702686090,16686795846,165079509042,
 1646340228006,16534463822010,167081444125702,
 1697551974416706,17330661859937670,
 177699201786231530]

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Last modified August 22 05:00 EDT 2019. Contains 326172 sequences. (Running on oeis4.)