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A052608 as a simple table

na(n)
01
11
26
342
4408
54920
671280
71204560
823264640
9505491840
1012203654400
11324084499200
129388910361600
13294668851276800
149959509521561600
15360665744414976000
1613931586106454016000
17571775010100310016000

[1,1,6,42,408,4920,71280,1204560,23264640,
 505491840,12203654400,324084499200,9388910361600,
 294668851276800,9959509521561600,
 360665744414976000,13931586106454016000,
 571775010100310016000]