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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 126 |
| 3 | 207 |
| 4 | 633 |
| 5 | 1811 |
| 6 | 4997 |
| 7 | 13856 |
| 8 | 38736 |
| 9 | 109231 |
| 10 | 310419 |
| 11 | 888448 |
| 12 | 2558995 |
| 13 | 7412354 |
| 14 | 21577360 |
| 15 | 63084725 |
| 16 | 185133501 |
| 17 | 545075812 |
| 18 | 1609314717 |
| 19 | 4762800580 |
| 20 | 14124361768 |
| 21 | 41959331051 |
| 22 | 124832686231 |
| 23 | 371852935856 |
| 24 | 1108854732663 |
[1,126,207,633,1811,4997,13856,38736,109231, 310419,888448,2558995,7412354,21577360,63084725, 185133501,545075812,1609314717,4762800580, 14124361768,41959331051,124832686231,371852935856, 1108854732663] |