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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 29 |
| 4 | 94 |
| 5 | 311 |
| 6 | 1049 |
| 7 | 3597 |
| 8 | 12506 |
| 9 | 43992 |
| 10 | 156298 |
| 11 | 560082 |
| 12 | 2021980 |
| 13 | 7347281 |
| 14 | 26851465 |
| 15 | 98633085 |
| 16 | 363961890 |
| 17 | 1348553940 |
| 18 | 5015206350 |
| 19 | 18714132390 |
| 20 | 70045890660 |
| 21 | 262915076190 |
| 22 | 989394563274 |
| 23 | 3732136740498 |
| 24 | 14109191590724 |
[1,3,9,29,94,311,1049,3597,12506,43992,156298, 560082,2021980,7347281,26851465,98633085, 363961890,1348553940,5015206350,18714132390, 70045890660,262915076190,989394563274, 3732136740498,14109191590724] |