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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 84 |
| 3 | 863 |
| 4 | 7940 |
| 5 | 68790 |
| 6 | 573342 |
| 7 | 4651079 |
| 8 | 36985536 |
| 9 | 289643385 |
| 10 | 2240964186 |
| 11 | 17168776578 |
| 12 | 130470758748 |
| 13 | 984730068189 |
| 14 | 7389045257436 |
| 15 | 55166274822951 |
| 16 | 410065744877280 |
| 17 | 3036389212951326 |
| 18 | 22406600046050874 |
| 19 | 164842346594552499 |
[6,84,863,7940,68790,573342,4651079,36985536, 289643385,2240964186,17168776578,130470758748, 984730068189,7389045257436,55166274822951, 410065744877280,3036389212951326, 22406600046050874,164842346594552499] |