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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 18 |
| 5 | 770 |
| 6 | 20805 |
| 7 | 522753 |
| 8 | 9593507 |
| 9 | 138576324 |
| 10 | 1907158560 |
| 11 | 25880343115 |
| 12 | 341234146077 |
| 13 | 4348150676532 |
| 14 | 53202598238062 |
| 15 | 622919366722485 |
| 16 | 6980872709154870 |
| 17 | 75312434538456228 |
| 18 | 787522030868617855 |
[1,3,18,770,20805,522753,9593507,138576324, 1907158560,25880343115,341234146077,4348150676532, 53202598238062,622919366722485,6980872709154870, 75312434538456228,787522030868617855] |