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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 22 |
| 3 | 1452 |
| 4 | 195800 |
| 5 | 44765000 |
| 6 | 15548960784 |
| 7 | 7634832149392 |
| 8 | 5036317938475648 |
| 9 | 4297211671488276816 |
| 10 | 4605775111899791292320 |
| 11 | 6058134671618508819536768 |
| 12 | 9595073255473201184093573376 |
| 13 | 18012849924775292436074080925056 |
| 14 | 39551575929026035832580350736305920 |
[1,1,22,1452,195800,44765000,15548960784, 7634832149392,5036317938475648, 4297211671488276816,4605775111899791292320, 6058134671618508819536768, 9595073255473201184093573376, 18012849924775292436074080925056, 39551575929026035832580350736305920] |