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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 33 |
| 3 | 924 |
| 4 | 17556 |
| 5 | 1141140 |
| 6 | 1025884860 |
| 7 | 17440042620 |
| 8 | 715041747420 |
| 9 | 16445960190660 |
| 10 | 115121721334620 |
| 11 | 345365164003860 |
| 12 | 1242969225249892140 |
| 13 | 382452069307659120 |
| 14 | 27154096920843797520 |
| 15 | 1004701586071220508240 |
[1,33,924,17556,1141140,1025884860,17440042620, 715041747420,16445960190660,115121721334620, 345365164003860,1242969225249892140, 382452069307659120,27154096920843797520, 1004701586071220508240] |