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A071605 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 18 |
| 4 | 216 |
| 5 | 6840 |
| 6 | 228960 |
| 7 | 15573600 |
| 8 | 994533120 |
| 9 | 85232891520 |
| 10 | 8641918252800 |
| 11 | 1068888956889600 |
| 12 | 155398203460684800 |
| 13 | 26564263279602048000 |
[1,3,18,216,6840,228960,15573600,994533120, 85232891520,8641918252800,1068888956889600, 155398203460684800,26564263279602048000] |