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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 723 |
| 3 | 13756 |
| 4 | 523451 |
| 5 | 9959325 |
| 6 | 378977801 |
| 7 | 7210537544 |
| 8 | 274379404473 |
| 9 | 5220419222531 |
| 10 | 198650309860651 |
| 11 | 3779576306574900 |
| 12 | 143822549959706851 |
| 13 | 2736408025541005069 |
| 14 | 104127327520517899473 |
| 15 | 1981155630915381095056 |
| 16 | 75388041302304999511601 |
[1,19,723,13756,523451,9959325,378977801, 7210537544,274379404473,5220419222531, 198650309860651,3779576306574900, 143822549959706851,2736408025541005069, 104127327520517899473,1981155630915381095056, 75388041302304999511601] |