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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 4 |
| 3 | 12 |
| 4 | 43 |
| 5 | 91 |
| 6 | 519 |
| 7 | 1721 |
| 8 | 5886 |
| 9 | 24858 |
| 10 | 89458 |
| 11 | 331545 |
| 12 | 1293081 |
| 13 | 4800200 |
| 14 | 18085436 |
| 15 | 68906303 |
| 16 | 258751342 |
| 17 | 977403762 |
| 18 | 3699805618 |
| 19 | 13947688934 |
| 20 | 52692144086 |
| 21 | 199113543247 |
| 22 | 751576314916 |
| 23 | 2838921851835 |
| 24 | 10723095436605 |
| 25 | 40491350276075 |
[3,4,12,43,91,519,1721,5886,24858,89458,331545, 1293081,4800200,18085436,68906303,258751342, 977403762,3699805618,13947688934,52692144086, 199113543247,751576314916,2838921851835, 10723095436605,40491350276075] |