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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 59 |
| 4 | 464 |
| 5 | 4036 |
| 6 | 37394 |
| 7 | 361752 |
| 8 | 3611342 |
| 9 | 36924037 |
| 10 | 384695774 |
| 11 | 4069309941 |
| 12 | 43587515276 |
| 13 | 471807637123 |
| 14 | 5152872105955 |
| 15 | 56712277598154 |
| 16 | 628369045481689 |
| 17 | 7003390219941228 |
| 18 | 78462945395340756 |
| 19 | 883157697492760759 |
| 20 | 9982097511692809864 |
| 21 | 113250010579766749951 |
[1,2,9,59,464,4036,37394,361752,3611342,36924037, 384695774,4069309941,43587515276,471807637123, 5152872105955,56712277598154,628369045481689, 7003390219941228,78462945395340756, 883157697492760759,9982097511692809864, 113250010579766749951] |