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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 150 |
| 3 | 4200 |
| 4 | 131670 |
| 5 | 4360356 |
| 6 | 149885736 |
| 7 | 5287716720 |
| 8 | 190170736470 |
| 9 | 6941694002100 |
| 10 | 256393942704900 |
| 11 | 9561265547652000 |
| 12 | 359399657792284200 |
| 13 | 13600394660797333200 |
| 14 | 517621830467456905200 |
| 15 | 19798076590576557847200 |
| 16 | 760517744810283004728150 |
| 17 | 29325625363665142395552900 |
[1,6,150,4200,131670,4360356,149885736,5287716720, 190170736470,6941694002100,256393942704900, 9561265547652000,359399657792284200, 13600394660797333200,517621830467456905200, 19798076590576557847200,760517744810283004728150, 29325625363665142395552900] |