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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 40 |
| 4 | 630 |
| 5 | 72576 |
| 6 | 3326400 |
| 7 | 148262400 |
| 8 | 13621608000 |
| 9 | 75277762560 |
| 10 | 243290200817664 |
| 11 | 2322315553259520000 |
| 12 | 538583682060103680000 |
| 13 | 85226428809510912000000 |
| 14 | 27777728189842735104000000 |
| 15 | 147362699895661699242393600000 |
| 16 | 4282728465717668134232064000000 |
[2,3,40,630,72576,3326400,148262400,13621608000, 75277762560,243290200817664,2322315553259520000, 538583682060103680000,85226428809510912000000, 27777728189842735104000000, 147362699895661699242393600000, 4282728465717668134232064000000] |