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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 42 |
| 3 | 2440 |
| 4 | 373780 |
| 5 | 87852160 |
| 6 | 37060650272 |
| 7 | 20358402201792 |
| 8 | 17131843186425504 |
| 9 | 17423570614012565376 |
| 10 | 24860319276726031245440 |
| 11 | 41082882676098706722895360 |
| 12 | 90015726535715347904300537088 |
| 13 | 222247072052822589353800809064448 |
[2,42,2440,373780,87852160,37060650272, 20358402201792,17131843186425504, 17423570614012565376,24860319276726031245440, 41082882676098706722895360, 90015726535715347904300537088, 222247072052822589353800809064448] |