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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 11 |
| 4 | 23 |
| 5 | 170 |
| 6 | 1081 |
| 7 | 6673 |
| 8 | 43084 |
| 9 | 275081 |
| 10 | 1851148 |
| 11 | 12573215 |
| 12 | 86880021 |
| 13 | 606290719 |
| 14 | 4278004277 |
| 15 | 30455293018 |
| 16 | 218512831477 |
[1,11,23,170,1081,6673,43084,275081,1851148, 12573215,86880021,606290719,4278004277, 30455293018,218512831477] |