| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 14 |
| 5 | 25 |
| 6 | 45 |
| 7 | 82 |
| 8 | 149 |
| 9 | 270 |
| 10 | 489 |
| 11 | 886 |
| 12 | 1606 |
| 13 | 2911 |
| 14 | 5276 |
| 15 | 9562 |
| 16 | 17330 |
| 17 | 31409 |
| 18 | 56926 |
| 19 | 103173 |
| 20 | 186991 |
| 21 | 338903 |
| 22 | 614229 |
| 23 | 1113231 |
| 24 | 2017624 |
| 25 | 3656749 |
| 26 | 6627505 |
| 27 | 12011714 |
| 28 | 21770074 |
| 29 | 39456161 |
| 30 | 71510489 |
| 31 | 129605869 |
| 32 | 234898146 |
| 33 | 425730250 |
| 34 | 771595046 |
| 35 | 1398441654 |
[1,2,4,8,14,25,45,82,149,270,489,886,1606,2911, 5276,9562,17330,31409,56926,103173,186991,338903, 614229,1113231,2017624,3656749,6627505,12011714, 21770074,39456161,71510489,129605869,234898146, 425730250,771595046,1398441654] |