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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 341 |
| 3 | 6119 |
| 4 | 109801 |
| 5 | 1970299 |
| 6 | 35355581 |
| 7 | 634430159 |
| 8 | 11384387281 |
| 9 | 204284540899 |
| 10 | 3665737348901 |
| 11 | 65778987739319 |
| 12 | 1180356041958841 |
| 13 | 21180629767519819 |
| 14 | 380070979773397901 |
| 15 | 6820097006153642399 |
| 16 | 122381675130992165281 |
| 17 | 2196050055351705332659 |
| 18 | 39406519321199703822581 |
[1,19,341,6119,109801,1970299,35355581,634430159, 11384387281,204284540899,3665737348901, 65778987739319,1180356041958841,21180629767519819, 380070979773397901,6820097006153642399, 122381675130992165281,2196050055351705332659, 39406519321199703822581] |