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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 24 |
| 4 | 91 |
| 5 | 376 |
| 6 | 1635 |
| 7 | 7377 |
| 8 | 34197 |
| 9 | 161876 |
| 10 | 779125 |
| 11 | 3801307 |
| 12 | 18757219 |
| 13 | 93444662 |
| 14 | 469349303 |
| 15 | 2374206202 |
| 16 | 12084696935 |
| 17 | 61848753886 |
| 18 | 318082531211 |
| 19 | 1643009103729 |
| 20 | 8520055528453 |
| 21 | 44338931718570 |
| 22 | 231488012768833 |
[1,3,7,24,91,376,1635,7377,34197,161876,779125, 3801307,18757219,93444662,469349303,2374206202, 12084696935,61848753886,318082531211, 1643009103729,8520055528453,44338931718570, 231488012768833] |