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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 168 |
| 3 | 3466 |
| 4 | 62400 |
| 5 | 1037774 |
| 6 | 16734366 |
| 7 | 268264812 |
| 8 | 4294285044 |
| 9 | 68716748256 |
| 10 | 1099500713960 |
| 11 | 17592142389240 |
| 12 | 281474802089984 |
| 13 | 4503598928887808 |
| 14 | 72057591243997184 |
| 15 | 1152921493431123968 |
| 16 | 18446744029006659584 |
[8,168,3466,62400,1037774,16734366,268264812, 4294285044,68716748256,1099500713960, 17592142389240,281474802089984,4503598928887808, 72057591243997184,1152921493431123968, 18446744029006659584] |