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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 24 |
| 3 | 852 |
| 4 | 35744 |
| 5 | 1645794 |
| 6 | 80415216 |
| 7 | 4094489992 |
| 8 | 214888573248 |
| 9 | 11542515402255 |
| 10 | 631467591949480 |
| 11 | 35063515239394764 |
| 12 | 1971043639046131296 |
| 13 | 111949770626330347638 |
| 14 | 6414671157989386260432 |
| 15 | 370360217892318010055832 |
[1,24,852,35744,1645794,80415216,4094489992, 214888573248,11542515402255,631467591949480, 35063515239394764,1971043639046131296, 111949770626330347638,6414671157989386260432, 370360217892318010055832] |