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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 27 |
| 3 | 79 |
| 4 | 199 |
| 5 | 459 |
| 6 | 1003 |
| 7 | 2119 |
| 8 | 4383 |
| 9 | 8947 |
| 10 | 18115 |
| 11 | 36495 |
| 12 | 73303 |
| 13 | 146971 |
| 14 | 294363 |
| 15 | 589207 |
| 16 | 1178959 |
| 17 | 2358531 |
| 18 | 4717747 |
| 19 | 9436255 |
| 20 | 18873351 |
| 21 | 37747627 |
| 22 | 75496267 |
| 23 | 150993639 |
| 24 | 301988479 |
| 25 | 603978259 |
| 26 | 1207957923 |
| 27 | 2415917359 |
| 28 | 4831836343 |
| 29 | 9663674427 |
| 30 | 19327350715 |
[1,7,27,79,199,459,1003,2119,4383,8947,18115, 36495,73303,146971,294363,589207,1178959,2358531, 4717747,9436255,18873351,37747627,75496267, 150993639,301988479,603978259,1207957923, 2415917359,4831836343,9663674427,19327350715] |