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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 981 |
| 5 | 24621 |
| 6 | 803143 |
| 7 | 32390247 |
| 8 | 1560845289 |
| 9 | 87688371385 |
| 10 | 5637912173451 |
| 11 | 408922311037659 |
| 12 | 33077570245035517 |
| 13 | 2956347175261764597 |
| 14 | 289716070585295689455 |
| 15 | 30931475430329804121871 |
| 16 | 3578416722896540323224657 |
| 17 | 446526125468639494991613297 |
[1,1,5,55,981,24621,803143,32390247,1560845289, 87688371385,5637912173451,408922311037659, 33077570245035517,2956347175261764597, 289716070585295689455,30931475430329804121871, 3578416722896540323224657, 446526125468639494991613297] |