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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 236 |
| 5 | 18684 |
| 6 | 32463802 |
| 7 | 54756073582 |
| 8 | 2365714170297014 |
| 9 | 87106950271042689032 |
| 10 | 88514516642574170326003422 |
| 11 | 71598455565101470929617326988084 |
| 12 | 1673219200189416324422979402201514800461 |
| 13 | 29815394539834813572600735261571894552950941626 |
[1,4,236,18684,32463802,54756073582, 2365714170297014,87106950271042689032, 88514516642574170326003422, 71598455565101470929617326988084, 1673219200189416324422979402201514800461, 29815394539834813572600735261571894552950941626] |