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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 45 |
| 4 | 482 |
| 5 | 5665 |
| 6 | 70725 |
| 7 | 921174 |
| 8 | 12379878 |
| 9 | 170435921 |
| 10 | 2391736448 |
| 11 | 34089385297 |
| 12 | 492181254691 |
| 13 | 7183748957321 |
| 14 | 105830560089572 |
| 15 | 1571662656809121 |
| 16 | 23504719106546214 |
| 17 | 353701665355036178 |
| 18 | 5351873694519004045 |
| 19 | 81378581395212130011 |
[1,1,5,45,482,5665,70725,921174,12379878, 170435921,2391736448,34089385297,492181254691, 7183748957321,105830560089572,1571662656809121, 23504719106546214,353701665355036178, 5351873694519004045,81378581395212130011] |