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A038035 as a simple table

n a(n)
1 1
2 2
3 9
4 72
5 840
6 12780
7 238770
8 5281920
9 134946000
10 3909578400
11 126638542800
12 4535037460800
13 177904622095200
14 7586967310322400
15 349479111223242000
16 17292052928037888000
17 914673660594613920000
18 51506610632458293312000
19 3076341001739003430432000

[1,2,9,72,840,12780,238770,5281920,134946000,
 3909578400,126638542800,4535037460800,
 177904622095200,7586967310322400,
 349479111223242000,17292052928037888000,
 914673660594613920000,51506610632458293312000,
 3076341001739003430432000]

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Last modified May 22 21:05 EDT 2019. Contains 323503 sequences. (Running on oeis4.)