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A089066 as a simple table

n a(n)
1 1
2 1
3 1
4 3
5 8
6 38
7 192
8 1320
9 10176
10 91296
11 908160
12 9985920
13 119761920
14 1556847360
15 21794734080
16 326920043520
17 5230700052480
18 88921882828800
19 1600593472880640
20 30411275613143040
21 608225502973132800

[1,1,1,3,8,38,192,1320,10176,91296,908160,9985920,
 119761920,1556847360,21794734080,326920043520,
 5230700052480,88921882828800,1600593472880640,
 30411275613143040,608225502973132800]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)