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A254939 as a simple table

n a(n)
1 1
2 4
3 36
4 120
5 2520
6 277200
7 5045040
8 183783600
9 4655851200
10 80313433200
11 32607253879200
12 2743667504978400
13 58772246027695200
14 5038384364010597600
15 56517528952814529600
16 34089489546705963770400
17 7391221142626702144764000

[1,4,36,120,2520,277200,5045040,183783600,
 4655851200,80313433200,32607253879200,
 2743667504978400,58772246027695200,
 5038384364010597600,56517528952814529600,
 34089489546705963770400,7391221142626702144764000]

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Last modified August 10 22:22 EDT 2020. Contains 336403 sequences. (Running on oeis4.)