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A257113 as a simple table

na(n)
12
23
35
410
520
640
780
8160
9320
10640
111280
122560
135120
1410240
1520480
1640960
1781920
18163840
19327680
20655360
211310720
222621440
235242880
2410485760
2520971520
2641943040
2783886080
28167772160
29335544320
30671088640
311342177280
322684354560
335368709120
3410737418240

[2,3,5,10,20,40,80,160,320,640,1280,2560,5120,
 10240,20480,40960,81920,163840,327680,655360,
 1310720,2621440,5242880,10485760,20971520,
 41943040,83886080,167772160,335544320,671088640,
 1342177280,2684354560,5368709120,10737418240]