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A006963 as a simple table

na(n)
11
21
33
420
5210
63024
755440
81235520
932432400
10980179200
1133522128640
121279935820800
1353970627110400
142490952020480000
15124903451312640000
166761440164390912000
17393008709555221760000
1824412776311194951680000
191613955767240110694400000

[1,1,3,20,210,3024,55440,1235520,32432400,
 980179200,33522128640,1279935820800,
 53970627110400,2490952020480000,
 124903451312640000,6761440164390912000,
 393008709555221760000,24412776311194951680000,
 1613955767240110694400000]