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| n | a(n) |
|---|---|
| 1 | 34 |
| 2 | 280 |
| 3 | 2304 |
| 4 | 19008 |
| 5 | 156800 |
| 6 | 1293568 |
| 7 | 10671616 |
| 8 | 88038400 |
| 9 | 726296576 |
| 10 | 5991780352 |
| 11 | 49430814720 |
| 12 | 407792893952 |
| 13 | 3364197924864 |
| 14 | 27753861939200 |
| 15 | 228963000909824 |
| 16 | 1888892288237568 |
| 17 | 15582928518512640 |
| 18 | 128555589286494208 |
[34,280,2304,19008,156800,1293568,10671616, 88038400,726296576,5991780352,49430814720, 407792893952,3364197924864,27753861939200, 228963000909824,1888892288237568, 15582928518512640,128555589286494208] |