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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 432 |
| 3 | 1152 |
| 4 | 8273 |
| 5 | 57984 |
| 6 | 421793 |
| 7 | 3056856 |
| 8 | 22207559 |
| 9 | 160767947 |
| 10 | 1166126087 |
| 11 | 8461160013 |
| 12 | 61425788827 |
| 13 | 445787882372 |
| 14 | 3235147655180 |
| 15 | 23477974651336 |
| 16 | 170398268043384 |
| 17 | 1236726092295065 |
| 18 | 8975919178977093 |
| 19 | 65144744923024289 |
[16,432,1152,8273,57984,421793,3056856,22207559, 160767947,1166126087,8461160013,61425788827, 445787882372,3235147655180,23477974651336, 170398268043384,1236726092295065,8975919178977093, 65144744923024289] |