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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 99 |
| 3 | 827 |
| 4 | 6743 |
| 5 | 55447 |
| 6 | 454385 |
| 7 | 3729091 |
| 8 | 30584687 |
| 9 | 250916131 |
| 10 | 2058249165 |
| 11 | 16884649135 |
| 12 | 138508056265 |
| 13 | 1136221529549 |
| 14 | 9320704799431 |
| 15 | 76460212316453 |
| 16 | 627222736888811 |
| 17 | 5145271430670385 |
| 18 | 42207992410219447 |
| 19 | 346243111960194009 |
[13,99,827,6743,55447,454385,3729091,30584687, 250916131,2058249165,16884649135,138508056265, 1136221529549,9320704799431,76460212316453, 627222736888811,5145271430670385, 42207992410219447,346243111960194009] |