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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 73 |
| 3 | 301 |
| 4 | 1057 |
| 5 | 12005 |
| 6 | 76692 |
| 7 | 431723 |
| 8 | 3338387 |
| 9 | 23694911 |
| 10 | 160290601 |
| 11 | 1169727060 |
| 12 | 8508584171 |
| 13 | 61149185363 |
| 14 | 447149103717 |
| 15 | 3281694474016 |
| 16 | 24037530274436 |
| 17 | 176807186467726 |
| 18 | 1303136084563758 |
| 19 | 9604835986239513 |
| 20 | 70874413268008409 |
[1,73,301,1057,12005,76692,431723,3338387, 23694911,160290601,1169727060,8508584171, 61149185363,447149103717,3281694474016, 24037530274436,176807186467726,1303136084563758, 9604835986239513,70874413268008409] |