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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 42 |
| 5 | 133 |
| 6 | 443 |
| 7 | 1552 |
| 8 | 5716 |
| 9 | 22068 |
| 10 | 88830 |
| 11 | 370209 |
| 12 | 1585841 |
| 13 | 6936459 |
| 14 | 30813483 |
| 15 | 138445492 |
| 16 | 627256282 |
| 17 | 2859652414 |
| 18 | 13099023380 |
| 19 | 60225071992 |
| 20 | 277729496928 |
| 21 | 1283986487874 |
| 22 | 5948991719082 |
| 23 | 27616185153765 |
[1,2,5,14,42,133,443,1552,5716,22068,88830,370209, 1585841,6936459,30813483,138445492,627256282, 2859652414,13099023380,60225071992,277729496928, 1283986487874,5948991719082,27616185153765] |