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A098664 as a simple table

na(n)
01
11
28
312
496
5160
61280
72240
817920
932256
10258048
11473088
123784704
137028736
1456229888
15105431040
16843448320
171593180160
1812745441280
1924216338432
20193730707456
21369849532416
222958796259328
235671026163712
2445368209309696

[1,1,8,12,96,160,1280,2240,17920,32256,258048,
 473088,3784704,7028736,56229888,105431040,
 843448320,1593180160,12745441280,24216338432,
 193730707456,369849532416,2958796259328,
 5671026163712,45368209309696]