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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 162 |
| 3 | 1470 |
| 4 | 13170 |
| 5 | 117690 |
| 6 | 1047700 |
| 7 | 9298730 |
| 8 | 82332898 |
| 9 | 727588212 |
| 10 | 6419787202 |
| 11 | 56572605706 |
| 12 | 498017769108 |
| 13 | 4380455260922 |
| 14 | 38503151114834 |
| 15 | 338244048166260 |
| 16 | 2970058795869778 |
| 17 | 26069751578988858 |
| 18 | 228757355654899732 |
[16,162,1470,13170,117690,1047700,9298730, 82332898,727588212,6419787202,56572605706, 498017769108,4380455260922,38503151114834, 338244048166260,2970058795869778, 26069751578988858,228757355654899732] |