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A204446 as a simple table

na(n)
11
21
33
49
534
6116
7792
84752
932304
10202320
111991952
1217927568
13175473216
141613364480
1520695108608
16248341303296
173173837230080
1838575603814400
19610011772416000
209150176586240000
21144343174487040000
222183607168215040000

[1,1,3,9,34,116,792,4752,32304,202320,1991952,
 17927568,175473216,1613364480,20695108608,
 248341303296,3173837230080,38575603814400,
 610011772416000,9150176586240000,
 144343174487040000,2183607168215040000]