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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 4 |
| 3 | 27 |
| 4 | 448 |
| 5 | 10625 |
| 6 | 344736 |
| 7 | 14437213 |
| 8 | 753991680 |
| 9 | 47974773393 |
| 10 | 3650824000000 |
| 11 | 326917384798301 |
| 12 | 33956137832546304 |
| 13 | 4041303651931462969 |
| 14 | 545552768347831566336 |
| 15 | 82828479894303251953125 |
| 16 | 14040577418634835164921856 |
| 17 | 2640293357854435329683551265 |
[1,0,4,27,448,10625,344736,14437213,753991680, 47974773393,3650824000000,326917384798301, 33956137832546304,4041303651931462969, 545552768347831566336,82828479894303251953125, 14040577418634835164921856, 2640293357854435329683551265] |