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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1240 |
| 2 | 635660 |
| 3 | 173158720 |
| 4 | 26866494270 |
| 5 | 2390772025248 |
| 6 | 123244340937400 |
| 7 | 4235204881123840 |
| 8 | 107367902876988285 |
| 9 | 2147149471392237840 |
| 10 | 35461233105160369124 |
| 11 | 499800581310885326080 |
| 12 | 6159994549959101077830 |
[1,1240,635660,173158720,26866494270, 2390772025248,123244340937400,4235204881123840, 107367902876988285,2147149471392237840, 35461233105160369124,499800581310885326080, 6159994549959101077830] |