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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 35 |
| 6 | 861 |
| 7 | 18424 |
| 8 | 367290 |
| 9 | 7028847 |
| 10 | 131115985 |
| 11 | 2404808340 |
| 12 | 43595145594 |
| 13 | 783768050065 |
| 14 | 14005614014756 |
| 15 | 249145778809200 |
| 16 | 4416904685676756 |
| 17 | 78098259661387182 |
| 18 | 1378095785451705375 |
| 19 | 24278663343508481600 |
[1,35,861,18424,367290,7028847,131115985, 2404808340,43595145594,783768050065, 14005614014756,249145778809200,4416904685676756, 78098259661387182,1378095785451705375, 24278663343508481600] |