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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 18 |
| 3 | 143 |
| 4 | 816 |
| 5 | 4467 |
| 6 | 27192 |
| 7 | 158296 |
| 8 | 915920 |
| 9 | 5443662 |
| 10 | 31825008 |
| 11 | 185788218 |
| 12 | 1094039664 |
| 13 | 6406886173 |
| 14 | 37509117127 |
| 15 | 220173740293 |
| 16 | 1290097909772 |
| 17 | 7558886967916 |
| 18 | 44324041325721 |
[2,18,143,816,4467,27192,158296,915920,5443662, 31825008,185788218,1094039664,6406886173, 37509117127,220173740293,1290097909772, 7558886967916,44324041325721] |