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A110561 as a simple table

na(n)
01
11
21
33
48
540
6180
7140
8896
972576
10604800
116652800
1268428800
1359304960
14726485760
15163459296000
162324754432000
1739520825344000
18640237370572800
19579262382899200
2010532043325440000
214644631106519040000

[1,1,1,3,8,40,180,140,896,72576,604800,6652800,
 68428800,59304960,726485760,163459296000,
 2324754432000,39520825344000,640237370572800,
 579262382899200,10532043325440000,
 4644631106519040000]