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A096471 as a simple table

na(n)
21
33
412
560
6345
72415
818480
9166320
101596105
1117557155
12202951980
132638375740
1435703612945
15535554194175
168307234936000
17141222993912000
182470641012464625
1946942179236827875
20914462992955011500

[1,3,12,60,345,2415,18480,166320,1596105,17557155,
 202951980,2638375740,35703612945,535554194175,
 8307234936000,141222993912000,2470641012464625,
 46942179236827875,914462992955011500]