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A073975 as a simple table

na(n)
10
20
30
412
5180
61440
79072
854432
9308448
101700352
119722592
1258335552
13356638464
142173796352
1513144674816
1678940272384
17472093588224
182821539889152
1916894457846784
20101366747080704
21608795590588416
223656220357427200
2321947538146863104
24131685228881178624

[0,0,0,12,180,1440,9072,54432,308448,1700352,
 9722592,58335552,356638464,2173796352,13144674816,
 78940272384,472093588224,2821539889152,
 16894457846784,101366747080704,608795590588416,
 3656220357427200,21947538146863104,
 131685228881178624]