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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 64 |
| 3 | 633 |
| 4 | 8356 |
| 5 | 96429 |
| 6 | 1133040 |
| 7 | 13182464 |
| 8 | 152082304 |
| 9 | 1755041376 |
| 10 | 20212718576 |
| 11 | 232567713472 |
| 12 | 2675565752448 |
| 13 | 30768380930304 |
| 14 | 353803395343872 |
| 15 | 4068017269164288 |
| 16 | 46771595781285888 |
| 17 | 537742555230347264 |
[4,64,633,8356,96429,1133040,13182464,152082304, 1755041376,20212718576,232567713472,2675565752448, 30768380930304,353803395343872,4068017269164288, 46771595781285888,537742555230347264] |