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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 30 |
| 4 | 88 |
| 5 | 299 |
| 6 | 978 |
| 7 | 3132 |
| 8 | 10106 |
| 9 | 32721 |
| 10 | 105779 |
| 11 | 341872 |
| 12 | 1105228 |
| 13 | 3573075 |
| 14 | 11550674 |
| 15 | 37340085 |
| 16 | 120711068 |
| 17 | 390227727 |
| 18 | 1261503955 |
| 19 | 4078113677 |
| 20 | 13183480921 |
| 21 | 42618760767 |
| 22 | 137775353596 |
| 23 | 445391843834 |
| 24 | 1439835858140 |
| 25 | 4654614404396 |
[2,10,30,88,299,978,3132,10106,32721,105779, 341872,1105228,3573075,11550674,37340085, 120711068,390227727,1261503955,4078113677, 13183480921,42618760767,137775353596,445391843834, 1439835858140,4654614404396] |