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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 41 |
| 5 | 122 |
| 6 | 365 |
| 7 | 1094 |
| 8 | 3281 |
| 9 | 9842 |
| 10 | 29525 |
| 11 | 88574 |
| 12 | 265721 |
| 13 | 797162 |
| 14 | 2391485 |
| 15 | 7174454 |
| 16 | 21523361 |
| 17 | 64570082 |
| 18 | 193710245 |
| 19 | 581130734 |
| 20 | 1743392201 |
| 21 | 5230176602 |
| 22 | 15690529805 |
| 23 | 47071589414 |
| 24 | 141214768241 |
| 25 | 423644304722 |
| 26 | 1270932914165 |
| 27 | 3812798742494 |
| 28 | 11438396227481 |
[1,2,5,14,41,122,365,1094,3281,9842,29525,88574, 265721,797162,2391485,7174454,21523361,64570082, 193710245,581130734,1743392201,5230176602, 15690529805,47071589414,141214768241,423644304722, 1270932914165,3812798742494,11438396227481] |