| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 13 |
| 4 | 28 |
| 5 | 69 |
| 6 | 149 |
| 7 | 330 |
| 8 | 755 |
| 9 | 1681 |
| 10 | 3756 |
| 11 | 8457 |
| 12 | 18937 |
| 13 | 42418 |
| 14 | 95183 |
| 15 | 213349 |
| 16 | 478204 |
| 17 | 1072285 |
| 18 | 2403885 |
| 19 | 5388986 |
| 20 | 12082011 |
| 21 | 27086537 |
| 22 | 60724492 |
| 23 | 136139073 |
| 24 | 305209713 |
| 25 | 684246754 |
| 26 | 1534012759 |
| 27 | 3439098365 |
| 28 | 7710098140 |
| 29 | 17285247541 |
| 30 | 38751739141 |
[2,7,13,28,69,149,330,755,1681,3756,8457,18937, 42418,95183,213349,478204,1072285,2403885,5388986, 12082011,27086537,60724492,136139073,305209713, 684246754,1534012759,3439098365,7710098140, 17285247541,38751739141] |