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A022073 as a simple table

n a(n)
0 1
1 40
2 760
3 9120
4 77560
5 1546224
6 2508000
7 31204160
8 34729720
9 300136200
10 259114704
11 1823305440
12 1327461600
13 8216920880
14 5341699520
15 29758804416
16 17701924600
17 91800254160
18 51294999960
19 249835104800
20 131880275664
21 614963569920
22 312126610080
23 1394448792000

[1,40,760,9120,77560,1546224,2508000,31204160,
 34729720,300136200,259114704,1823305440,
 1327461600,8216920880,5341699520,29758804416,
 17701924600,91800254160,51294999960,249835104800,
 131880275664,614963569920,312126610080,
 1394448792000]

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Last modified December 7 15:24 EST 2021. Contains 349581 sequences. (Running on oeis4.)