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| n | a(n) |
|---|---|
| 1 | 606 |
| 2 | 1572 |
| 3 | 4120 |
| 4 | 10834 |
| 5 | 28500 |
| 6 | 74886 |
| 7 | 196346 |
| 8 | 515066 |
| 9 | 1352304 |
| 10 | 3552428 |
| 11 | 9333678 |
| 12 | 24522392 |
| 13 | 64420184 |
| 14 | 169229954 |
| 15 | 444582618 |
| 16 | 1168011448 |
| 17 | 3068677974 |
| 18 | 8062255694 |
| 19 | 21181628238 |
| 20 | 55649517844 |
| 21 | 146205759750 |
| 22 | 384121780036 |
| 23 | 1009193088634 |
[606,1572,4120,10834,28500,74886,196346,515066, 1352304,3552428,9333678,24522392,64420184, 169229954,444582618,1168011448,3068677974, 8062255694,21181628238,55649517844,146205759750, 384121780036,1009193088634] |