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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 18 |
| 3 | 156 |
| 4 | 1758 |
| 5 | 24342 |
| 6 | 399480 |
| 7 | 7577700 |
| 8 | 163090500 |
| 9 | 3926104860 |
| 10 | 104520733560 |
| 11 | 3048811591680 |
| 12 | 96695722690200 |
| 13 | 3312942954681240 |
| 14 | 121938065727180480 |
| 15 | 4798400761979259120 |
| 16 | 201030443703421854480 |
| 17 | 8933622147642363338160 |
| 18 | 419725992843354254228640 |
[1,3,18,156,1758,24342,399480,7577700,163090500, 3926104860,104520733560,3048811591680, 96695722690200,3312942954681240, 121938065727180480,4798400761979259120, 201030443703421854480,8933622147642363338160, 419725992843354254228640] |