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A287740 as a simple table

na(n)
01
13
21
314
41
562
63
7252
83
91020
103
114092
123
1316380
1415
1565520
1615
17262128
1815
191048560
2015
214194288
2215
2316777200
2415
2567108848
2615
27268435440
2815
291073741808
30255
314294967040
32255
3317179868928
34255
3568719476480
36255
37274877906688
38255
391099511627552

[1,3,1,14,1,62,3,252,3,1020,3,4092,3,16380,15,
 65520,15,262128,15,1048560,15,4194288,15,16777200,
 15,67108848,15,268435440,15,1073741808,255,
 4294967040,255,17179868928,255,68719476480,255,
 274877906688,255,1099511627552]