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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 20 |
| 4 | 122 |
| 5 | 774 |
| 6 | 5247 |
| 7 | 38198 |
| 8 | 298139 |
| 9 | 2485690 |
| 10 | 22045130 |
| 11 | 207125874 |
| 12 | 2053771931 |
| 13 | 21416863948 |
| 14 | 234145149539 |
| 15 | 2676207794512 |
| 16 | 31898152797430 |
| 17 | 395584489687982 |
| 18 | 5093960430643323 |
| 19 | 67985187315217290 |
| 20 | 938835976835478467 |
| 21 | 13394336734762313862 |
| 22 | 197153821757472332126 |
[3,20,122,774,5247,38198,298139,2485690,22045130, 207125874,2053771931,21416863948,234145149539, 2676207794512,31898152797430,395584489687982, 5093960430643323,67985187315217290, 938835976835478467,13394336734762313862, 197153821757472332126] |