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A056457 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 720
12 720
13 15120
14 15120
15 191520
16 191520
17 1905120
18 1905120
19 16435440
20 16435440
21 129230640
22 129230640
23 953029440
24 953029440
25 6711344640
26 6711344640
27 45674188560

[0,0,0,0,0,0,0,0,0,0,720,720,15120,15120,191520,
 191520,1905120,1905120,16435440,16435440,
 129230640,129230640,953029440,953029440,
 6711344640,6711344640,45674188560]

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Last modified May 17 12:26 EDT 2024. Contains 372600 sequences. (Running on oeis4.)