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| n | a(n) |
|---|---|
| 1 | 14 |
| 2 | 588 |
| 3 | 2520 |
| 4 | 11466 |
| 5 | 167580 |
| 6 | 10999296 |
| 7 | 67858560 |
| 8 | 132723360 |
| 9 | 8644446720 |
| 10 | 31002402816 |
| 11 | 65367751680 |
| 12 | 10941315840000 |
| 13 | 13980221805312 |
| 14 | 24365070213120 |
| 15 | 225855341712000 |
| 16 | 317483934427296 |
| 17 | 901703887257600 |
| 18 | 1550629681348608 |
| 19 | 8494794723340800 |
[14,588,2520,11466,167580,10999296,67858560, 132723360,8644446720,31002402816,65367751680, 10941315840000,13980221805312,24365070213120, 225855341712000,317483934427296,901703887257600, 1550629681348608,8494794723340800] |