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A078841 as a simple table

na(n)
01
13
29
320
454
5112
6240
7648
81344
92816
105760
1112800
1226624
1362208
14129024
15270336
16552960
171114112
182293760
194915200
209961472
2120447232
2247775744
2396468992
24198180864
25411041792
26830472192
271698693120
283422552064
297046430720

[1,3,9,20,54,112,240,648,1344,2816,5760,12800,
 26624,62208,129024,270336,552960,1114112,2293760,
 4915200,9961472,20447232,47775744,96468992,
 198180864,411041792,830472192,1698693120,
 3422552064,7046430720]