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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 27 |
| 4 | 94 |
| 5 | 315 |
| 6 | 1067 |
| 7 | 3545 |
| 8 | 11767 |
| 9 | 38747 |
| 10 | 127061 |
| 11 | 414551 |
| 12 | 1347442 |
| 13 | 4362616 |
| 14 | 14078612 |
| 15 | 45290929 |
| 16 | 145291501 |
| 17 | 464864831 |
| 18 | 1483759703 |
| 19 | 4725204487 |
| 20 | 15016441266 |
| 21 | 47627848083 |
| 22 | 150784504858 |
| 23 | 476543143817 |
| 24 | 1503631824859 |
[1,2,8,27,94,315,1067,3545,11767,38747,127061, 414551,1347442,4362616,14078612,45290929, 145291501,464864831,1483759703,4725204487, 15016441266,47627848083,150784504858,476543143817, 1503631824859] |