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A073973 as a simple table

na(n)
10
22
36
424
5180
61440
79072
850544
9286416
101658880
119722592
1258335552
13356638464
142179768320
1513180786560
1679012495872
17472093588224
182821539889152
1916894457846784
20101356447675392
21608733733690368
223656096522698752
2321947538146863104
24131685228881178624

[0,2,6,24,180,1440,9072,50544,286416,1658880,
 9722592,58335552,356638464,2179768320,13180786560,
 79012495872,472093588224,2821539889152,
 16894457846784,101356447675392,608733733690368,
 3656096522698752,21947538146863104,
 131685228881178624]