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A145681 as a simple table

n a(n)
1 2
2 20
3 24
4 360
5 816
6 1056
7 12240
8 15840
9 29120
10 181632
11 2724480
12 9192960
13 13790400
14 15288000
15 93358848
16 199180800
17 1130734080
18 1400382720
19 25115166720
20 544161945600
21 3089165506560
22 11519246340096
23 172788695101440
24 274358081249280
25 5944425093734400
26 33746043993661440
27 7425442423511040000
28 25976914334122752000000
29 48787315395486187520000
30 56897897650906642513920

[2,20,24,360,816,1056,12240,15840,29120,181632,
 2724480,9192960,13790400,15288000,93358848,
 199180800,1130734080,1400382720,25115166720,
 544161945600,3089165506560,11519246340096,
 172788695101440,274358081249280,5944425093734400,
 33746043993661440,7425442423511040000,
 25976914334122752000000,48787315395486187520000,
 56897897650906642513920]

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Last modified August 7 11:56 EDT 2020. Contains 336276 sequences. (Running on oeis4.)