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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 8 |
| 4 | 32 |
| 5 | 320 |
| 6 | 2592 |
| 7 | 57472 |
| 8 | 946176 |
| 9 | 44302336 |
| 10 | 1482686464 |
| 11 | 143210315776 |
| 12 | 9732400087040 |
| 13 | 1915349322694656 |
| 14 | 263918421714927616 |
| 15 | 105091512697853313024 |
| 16 | 29316605112733216538624 |
| 17 | 23522116026027393322844160 |
| 18 | 13266245323073952003913678848 |
| 19 | 21392237922664971275489914126336 |
| 20 | 24362629720999005014327927695736832 |
[2,8,32,320,2592,57472,946176,44302336,1482686464, 143210315776,9732400087040,1915349322694656, 263918421714927616,105091512697853313024, 29316605112733216538624, 23522116026027393322844160, 13266245323073952003913678848, 21392237922664971275489914126336, 24362629720999005014327927695736832] |