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A081620 as a simple table

na(n)
11
24
312
448
5144
6576
7960
81260
93600
1082944
1146080
12184320
132985984
14129600
1555440
166881280
1714745600
1858982400
19106168320
20907200
2118662400
22247669456896
231321205760
242494800
25207360000
2645158400
277761600
28978447237120
29543581798400
302174327193600
311014686023680

[1,4,12,48,144,576,960,1260,3600,82944,46080,
 184320,2985984,129600,55440,6881280,14745600,
 58982400,106168320,907200,18662400,247669456896,
 1321205760,2494800,207360000,45158400,7761600,
 978447237120,543581798400,2174327193600,
 1014686023680]