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A099603 as a simple table

na(n)
01
12
24
312
420
564
6104
7336
8544
91760
102848
119216
1214912
1348256
1478080
15252672
16408832
171323008
182140672
196927360
2011208704
2136272128
2258689536
23189923328
24307302400
25994451456
261609056256
275207015424
288425127936
2927264286720

[1,2,4,12,20,64,104,336,544,1760,2848,9216,14912,
 48256,78080,252672,408832,1323008,2140672,6927360,
 11208704,36272128,58689536,189923328,307302400,
 994451456,1609056256,5207015424,8425127936,
 27264286720]