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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 52 |
| 4 | 660 |
| 5 | 11385 |
| 6 | 251832 |
| 7 | 6842220 |
| 8 | 221228244 |
| 9 | 8311401351 |
| 10 | 356190316416 |
| 11 | 17160064580802 |
| 12 | 918453056609946 |
| 13 | 54085054802995008 |
| 14 | 3475794779752572784 |
| 15 | 242103490865991893116 |
| 16 | 18170143514998451547348 |
[1,6,52,660,11385,251832,6842220,221228244, 8311401351,356190316416,17160064580802, 918453056609946,54085054802995008, 3475794779752572784,242103490865991893116, 18170143514998451547348] |