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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 14 |
| 3 | 342 |
| 4 | 12872 |
| 5 | 659280 |
| 6 | 42828912 |
| 7 | 3375009568 |
| 8 | 312860626304 |
| 9 | 33361836534144 |
| 10 | 4023352486200320 |
| 11 | 541461682626399744 |
| 12 | 80448618080927609856 |
| 13 | 13079749459734097573888 |
| 14 | 2309915877337042992324608 |
| 15 | 440332184936376095626076160 |
| 16 | 90117169223076699520606896128 |
[1,1,14,342,12872,659280,42828912,3375009568, 312860626304,33361836534144,4023352486200320, 541461682626399744,80448618080927609856, 13079749459734097573888,2309915877337042992324608, 440332184936376095626076160, 90117169223076699520606896128] |