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A112985 as a simple table

na(n)
01
14
21
31
42
51
616
74
816
91
10128
11256
1216
13256
1416
15256
162
171
1816
194
2016
214096
2265536
23256
2416
25256
2616384
27256
2833554432
2916
3016
31256
3216
331
3465536
35256
362
371048576
3816
39256
4065536
414294967296
4216
434
4416
454294967296
4617179869184
47256
4816
494294967296
502048

[1,4,1,1,2,1,16,4,16,1,128,256,16,256,16,256,2,1,
 16,4,16,4096,65536,256,16,256,16384,256,33554432,
 16,16,256,16,1,65536,256,2,1048576,16,256,65536,
 4294967296,16,4,16,4294967296,17179869184,256,16,
 4294967296,2048]