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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 37 |
| 4 | 163 |
| 5 | 742 |
| 6 | 3417 |
| 7 | 15920 |
| 8 | 75135 |
| 9 | 356274 |
| 10 | 1698999 |
| 11 | 8146005 |
| 12 | 39176567 |
| 13 | 188995010 |
| 14 | 914447693 |
| 15 | 4433447099 |
| 16 | 21536356139 |
| 17 | 104809992100 |
| 18 | 510795470725 |
| 19 | 2492722292419 |
| 20 | 12180001835433 |
| 21 | 59576187799646 |
| 22 | 291691287247123 |
| 23 | 1429462763111044 |
| 24 | 7010807607813331 |
| 25 | 34410279282825758 |
| 26 | 169010343748395951 |
[1,2,9,37,163,742,3417,15920,75135,356274,1698999, 8146005,39176567,188995010,914447693,4433447099, 21536356139,104809992100,510795470725, 2492722292419,12180001835433,59576187799646, 291691287247123,1429462763111044,7010807607813331, 34410279282825758,169010343748395951] |