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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 10 |
| 5 | 14 |
| 6 | 16 |
| 7 | 20 |
| 8 | 22 |
| 9 | 26 |
| 10 | 34 |
| 11 | 70 |
| 12 | 164 |
| 13 | 346 |
| 14 | 398 |
| 15 | 902 |
| 16 | 938 |
| 17 | 1426 |
| 18 | 1682 |
| 19 | 1928 |
| 20 | 3596 |
| 21 | 3796 |
| 22 | 15058 |
| 23 | 25654 |
| 24 | 37330 |
[2,4,8,10,14,16,20,22,26,34,70,164,346,398,902, 938,1426,1682,1928,3596,3796,15058,25654,37330] |