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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 18 |
| 2 | 322 |
| 3 | 5778 |
| 4 | 103682 |
| 5 | 1860498 |
| 6 | 33385282 |
| 7 | 599074578 |
| 8 | 10749957122 |
| 9 | 192900153618 |
| 10 | 3461452808002 |
| 11 | 62113250390418 |
| 12 | 1114577054219522 |
| 13 | 20000273725560978 |
| 14 | 358890350005878082 |
| 15 | 6440026026380244498 |
| 16 | 115561578124838522882 |
| 17 | 2073668380220713167378 |
[2,18,322,5778,103682,1860498,33385282,599074578, 10749957122,192900153618,3461452808002, 62113250390418,1114577054219522,20000273725560978, 358890350005878082,6440026026380244498, 115561578124838522882,2073668380220713167378] |