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A308345 as a simple table

na(n)
11
22
34
415
548
6310
71440
811970
985120
10821016
117257600
1291707000
13958003200
1413440913200
15178919989248
162809456650000
1741845579776000
18763629026160000
1912804747411456000
20257140635922025856
214918792391884800000
22106876408948152480000

[1,2,4,15,48,310,1440,11970,85120,821016,7257600,
 91707000,958003200,13440913200,178919989248,
 2809456650000,41845579776000,763629026160000,
 12804747411456000,257140635922025856,
 4918792391884800000,106876408948152480000]