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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 16 |
| 4 | 18 |
| 5 | 154 |
| 6 | 282 |
| 7 | 1976 |
| 8 | 5706 |
| 9 | 42470 |
| 10 | 147092 |
| 11 | 1196210 |
| 12 | 5215010 |
| 13 | 48697758 |
| 14 | 245354078 |
| 15 | 2815029508 |
| 16 | 16378986516 |
[2,2,16,18,154,282,1976,5706,42470,147092,1196210, 5215010,48697758,245354078,2815029508,16378986516] |