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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 34 |
| 3 | 2440 |
| 4 | 322768 |
| 5 | 87852160 |
| 6 | 33093252880 |
| 7 | 20358402201792 |
| 8 | 15604440074084672 |
| 9 | 17423570614012565376 |
| 10 | 22946861101272125055616 |
| 11 | 41082882676098706722895360 |
| 12 | 83889915459846520832774898688 |
| 13 | 222247072052822589353800809064448 |
[2,34,2440,322768,87852160,33093252880, 20358402201792,15604440074084672, 17423570614012565376,22946861101272125055616, 41082882676098706722895360, 83889915459846520832774898688, 222247072052822589353800809064448] |