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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 532 |
| 3 | 18544 |
| 4 | 758974 |
| 5 | 35337226 |
| 6 | 1833202384 |
| 7 | 104409838312 |
| 8 | 6456768305884 |
| 9 | 429818796312724 |
| 10 | 30587559391254736 |
| 11 | 2313781261593170464 |
| 12 | 185160727825248627112 |
| 13 | 15612253234853491025464 |
[1,19,532,18544,758974,35337226,1833202384, 104409838312,6456768305884,429818796312724, 30587559391254736,2313781261593170464, 185160727825248627112,15612253234853491025464] |