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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 180 |
| 2 | -3780 |
| 3 | 447840 |
| 4 | -59046660 |
| 5 | 8921092680 |
| 6 | -1463828444640 |
| 7 | 253953515257920 |
| 8 | -45858209756343300 |
| 9 | 8534765953624978260 |
| 10 | -1626301691950399586280 |
| 11 | 315807346469727624396960 |
| 12 | -62284193156782292089690080 |
| 13 | 12443904711281870749228431240 |
[1,180,-3780,447840,-59046660,8921092680, -1463828444640,253953515257920,-45858209756343300, 8534765953624978260,-1626301691950399586280, 315807346469727624396960, -62284193156782292089690080, 12443904711281870749228431240] |