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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 1080 |
| 3 | 47059 |
| 4 | 1703178 |
| 5 | 53355889 |
| 6 | 1491827492 |
| 7 | 38051383139 |
| 8 | 899713542225 |
| 9 | 19963535397227 |
| 10 | 419672473818646 |
| 11 | 8421847090410941 |
| 12 | 162325525523034609 |
| 13 | 3020162740527368685 |
| 14 | 54468878788851494328 |
| 15 | 955569173872191005683 |
[20,1080,47059,1703178,53355889,1491827492, 38051383139,899713542225,19963535397227, 419672473818646,8421847090410941, 162325525523034609,3020162740527368685, 54468878788851494328,955569173872191005683] |