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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 39 |
| 3 | 597 |
| 4 | 11991 |
| 5 | 260613 |
| 6 | 6129489 |
| 7 | 151078707 |
| 8 | 3867441111 |
| 9 | 101852866533 |
| 10 | 2744610170049 |
| 11 | 75348380209347 |
| 12 | 2100889194001761 |
| 13 | 59349600029522403 |
| 14 | 1695505948476461559 |
| 15 | 48909452234258070117 |
| 16 | 1422877722974198091351 |
| 17 | 41704912707174877940613 |
[1,3,39,597,11991,260613,6129489,151078707, 3867441111,101852866533,2744610170049, 75348380209347,2100889194001761,59349600029522403, 1695505948476461559,48909452234258070117, 1422877722974198091351,41704912707174877940613] |