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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 8 |
| 4 | 20 |
| 5 | 44 |
| 6 | 80 |
| 7 | 343 |
| 8 | 288 |
| 9 | 608 |
| 10 | 1023 |
| 11 | 2848 |
| 12 | 4095 |
| 13 | 40959 |
| 14 | 16383 |
| 15 | 32768 |
| 16 | 11375 |
| 17 | 655360 |
| 18 | 262143 |
| 19 | 3670016 |
| 20 | 1048575 |
| 21 | 2097151 |
[3,8,20,44,80,343,288,608,1023,2848,4095,40959, 16383,32768,11375,655360,262143,3670016,1048575, 2097151] |