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A074859 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 6
5 20
6 240
7 420
8 2688
9 18144
10 120960
11 2661120
12 7983360
13 103783680
14 1037836800
15 12454041600
16 149448499200
17 1693749657600
18 60974987673600
19 289631191449600
20 5792623828992000
21 121645100408832000
22 3568256278659072000
23 30776210403434496000
24 738629049682427904000
25 12310484161373798400000

[1,1,1,2,6,20,240,420,2688,18144,120960,2661120,
 7983360,103783680,1037836800,12454041600,
 149448499200,1693749657600,60974987673600,
 289631191449600,5792623828992000,
 121645100408832000,3568256278659072000,
 30776210403434496000,738629049682427904000,
 12310484161373798400000]

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Last modified May 14 20:39 EDT 2024. Contains 372533 sequences. (Running on oeis4.)