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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 6 |
| 3 | 17 |
| 4 | 121 |
| 5 | 808 |
| 6 | 5309 |
| 7 | 31867 |
| 8 | 195259 |
| 9 | 1186702 |
| 10 | 7278923 |
| 11 | 44469030 |
| 12 | 272153365 |
| 13 | 1664882089 |
| 14 | 10186344545 |
| 15 | 62320129032 |
| 16 | 381291184320 |
| 17 | 2332798942244 |
| 18 | 14272539880517 |
| 19 | 87322082146003 |
| 20 | 534253910737324 |
| 21 | 3268668709294790 |
[8,6,17,121,808,5309,31867,195259,1186702,7278923, 44469030,272153365,1664882089,10186344545, 62320129032,381291184320,2332798942244, 14272539880517,87322082146003,534253910737324, 3268668709294790] |