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A084215 as a simple table

na(n)
01
12
25
310
420
540
680
7160
8320
9640
101280
112560
125120
1310240
1420480
1540960
1681920
17163840
18327680
19655360
201310720
212621440
225242880
2310485760
2420971520
2541943040
2683886080
27167772160
28335544320
29671088640
301342177280
312684354560
325368709120
3310737418240

[1,2,5,10,20,40,80,160,320,640,1280,2560,5120,
 10240,20480,40960,81920,163840,327680,655360,
 1310720,2621440,5242880,10485760,20971520,
 41943040,83886080,167772160,335544320,671088640,
 1342177280,2684354560,5368709120,10737418240]