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A110373 as a simple table

na(n)
21
35
420
5124
6744
75928
847424
9426816
104268160
1150578560
12606942720
138369256960
14117169597440
151757543961600
1628120703385600
17498974747443200
188981545453977600
19177051737331302400
203541034746626048000

[1,5,20,124,744,5928,47424,426816,4268160,
 50578560,606942720,8369256960,117169597440,
 1757543961600,28120703385600,498974747443200,
 8981545453977600,177051737331302400,
 3541034746626048000]