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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 1280 |
| 3 | 258048 |
| 4 | 61915684608 |
| 5 | 55693912375296 |
| 6 | 121438247178129702912 |
| 7 | 257421633517130354786304 |
| 8 | 2315500753239971319979258675200 |
| 9 | 228767924384358907355717734220022985785344 |
| 10 | 1401261602585169235166028950498857285425561600 |
[15,1280,258048,61915684608,55693912375296, 121438247178129702912,257421633517130354786304, 2315500753239971319979258675200, 228767924384358907355717734220022985785344, 1401261602585169235166028950498857285425561600] |