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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 166 |
| 4 | 922 |
| 5 | 5136 |
| 6 | 28656 |
| 7 | 162028 |
| 8 | 910716 |
| 9 | 5162308 |
| 10 | 29554964 |
| 11 | 169886511 |
| 12 | 978214225 |
| 13 | 5650347932 |
| 14 | 32745824773 |
| 15 | 190185910978 |
| 16 | 1106505067832 |
| 17 | 6449387884888 |
| 18 | 37654438607875 |
| 19 | 220148079884339 |
| 20 | 1288689800220653 |
[6,36,166,922,5136,28656,162028,910716,5162308, 29554964,169886511,978214225,5650347932, 32745824773,190185910978,1106505067832, 6449387884888,37654438607875,220148079884339, 1288689800220653] |