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A081958 as a simple table

n a(n)
1 2
2 8
3 36
4 180
5 1080
6 7560
7 60480
8 524160
9 5241600
10 56609280
11 670602240
12 8622028800
13 118879488000
14 1793381990400
15 28158588057600
16 474249904128000
17 8447576417280000
18 159659194286592000
19 3162772610629632000
20 66117689869271040000
21 1445143792856924160000

[2,8,36,180,1080,7560,60480,524160,5241600,
 56609280,670602240,8622028800,118879488000,
 1793381990400,28158588057600,474249904128000,
 8447576417280000,159659194286592000,
 3162772610629632000,66117689869271040000,
 1445143792856924160000]

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Last modified January 21 03:58 EST 2022. Contains 350473 sequences. (Running on oeis4.)