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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 55 |
| 3 | 360 |
| 4 | 3630 |
| 5 | 29820 |
| 6 | 321300 |
| 7 | 3225600 |
| 8 | 38808000 |
| 9 | 466300800 |
| 10 | 6360379200 |
| 11 | 89703936000 |
| 12 | 1389213504000 |
| 13 | 22565765376000 |
| 14 | 394272204480000 |
| 15 | 7248941973504000 |
| 16 | 141496402037760000 |
| 17 | 2901258659819520000 |
| 18 | 62617333274496000000 |
| 19 | 1414755114367795200000 |
| 20 | 33446554797269053440000 |
[1,5,55,360,3630,29820,321300,3225600,38808000, 466300800,6360379200,89703936000,1389213504000, 22565765376000,394272204480000,7248941973504000, 141496402037760000,2901258659819520000, 62617333274496000000,1414755114367795200000, 33446554797269053440000] |