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A277936 as a simple table

na(n)
01
13
20
315
40
563
60
7255
80
91023
100
114095
120
1316383
140
1565535
160
17262143
180
191048575
200
214194303
220
2316777215
240
2567108863
260
27268435455
280
291073741823
300
314294967295
320
3317179869183
340
3568719476735
360
37274877906943
380
391099511627775
400
414398046511103
420

[1,3,0,15,0,63,0,255,0,1023,0,4095,0,16383,0,
 65535,0,262143,0,1048575,0,4194303,0,16777215,0,
 67108863,0,268435455,0,1073741823,0,4294967295,0,
 17179869183,0,68719476735,0,274877906943,0,
 1099511627775,0,4398046511103,0]