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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 108 |
| 3 | 693 |
| 4 | 5909 |
| 5 | 50949 |
| 6 | 442001 |
| 7 | 3861469 |
| 8 | 33851605 |
| 9 | 297360321 |
| 10 | 2615328377 |
| 11 | 23018938257 |
| 12 | 202689194753 |
| 13 | 1785196757685 |
| 14 | 15725574011217 |
| 15 | 138536812455865 |
| 16 | 1220524306616877 |
| 17 | 10753280301953245 |
| 18 | 94742171002825549 |
| 19 | 834738246801591597 |
[8,108,693,5909,50949,442001,3861469,33851605, 297360321,2615328377,23018938257,202689194753, 1785196757685,15725574011217,138536812455865, 1220524306616877,10753280301953245, 94742171002825549,834738246801591597] |