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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 114 |
| 3 | 978 |
| 4 | 7926 |
| 5 | 61962 |
| 6 | 472614 |
| 7 | 3541578 |
| 8 | 26190726 |
| 9 | 191733162 |
| 10 | 1392520614 |
| 11 | 10049975178 |
| 12 | 72163811526 |
| 13 | 516030592362 |
| 14 | 3677517616614 |
| 15 | 26134444136778 |
| 16 | 185292033880326 |
| 17 | 1311149786699562 |
| 18 | 9262681804120614 |
| 19 | 65346572412186378 |
[1,12,114,978,7926,61962,472614,3541578,26190726, 191733162,1392520614,10049975178,72163811526, 516030592362,3677517616614,26134444136778, 185292033880326,1311149786699562,9262681804120614, 65346572412186378] |