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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 378 |
| 5 | 13330 |
| 6 | 689715 |
| 7 | 30934071 |
| 8 | 1463659596 |
| 9 | 72481823352 |
| 10 | 3407856306435 |
| 11 | 142400570465307 |
| 12 | 5478965101306950 |
| 13 | 198874787418398598 |
| 14 | 6919440283487706065 |
| 15 | 232730571288134765160 |
| 16 | 7599816260357477794632 |
| 17 | 241028324482889751669040 |
[1,9,378,13330,689715,30934071,1463659596, 72481823352,3407856306435,142400570465307, 5478965101306950,198874787418398598, 6919440283487706065,232730571288134765160, 7599816260357477794632,241028324482889751669040] |