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| n | a(n) |
|---|---|
| 2 | 18 |
| 3 | 51102 |
| 4 | 124959234 |
| 5 | 526338968015 |
| 6 | 2719419327570456 |
| 7 | 14693123505348956696 |
| 8 | 72664207137416531057904 |
| 9 | 295216538355645216153560910 |
| 10 | 901062614916369636624902328980 |
| 11 | 1918631778745608122017797815817186 |
[18,51102,124959234,526338968015,2719419327570456, 14693123505348956696,72664207137416531057904, 295216538355645216153560910, 901062614916369636624902328980, 1918631778745608122017797815817186] |