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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 140 |
| 3 | 3360 |
| 4 | 97020 |
| 5 | 3171168 |
| 6 | 113369256 |
| 7 | 4338459840 |
| 8 | 175165316040 |
| 9 | 7385525026880 |
| 10 | 322747443674656 |
| 11 | 14534919841012480 |
| 12 | 671591162296782000 |
| 13 | 31725844951938480000 |
| 14 | 1527939354203180010000 |
| 15 | 74847268228930016688000 |
| 16 | 3722092276301165621547000 |
[1,8,140,3360,97020,3171168,113369256,4338459840, 175165316040,7385525026880,322747443674656, 14534919841012480,671591162296782000, 31725844951938480000,1527939354203180010000, 74847268228930016688000,3722092276301165621547000] |