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A289965 as a simple table

na(n)
01
12
27
315
428
560
6127
7254
8510
91021
102045
114090
128166
1316362
1432762
1565534
16130942
17262014
18524286
191048574
202097150
214194274
228388499
2316776879
2433553134
2567107581
26134217405
27268435134
28536869630
291073741822
302147481599
314294965223
328589921192

[1,2,7,15,28,60,127,254,510,1021,2045,4090,8166,
 16362,32762,65534,130942,262014,524286,1048574,
 2097150,4194274,8388499,16776879,33553134,
 67107581,134217405,268435134,536869630,1073741822,
 2147481599,4294965223,8589921192]