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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 459 |
| 4 | 29440 |
| 5 | 3680125 |
| 6 | 794907216 |
| 7 | 272653175431 |
| 8 | 139598425821184 |
| 9 | 101767252423643865 |
| 10 | 101767252423643866000 |
| 11 | 135452212975869985647331 |
| 12 | 234061424022303335198589696 |
| 13 | 514232948577000427431301564309 |
| 14 | 1411055210895289172871491492466640 |
[0,1,16,459,29440,3680125,794907216,272653175431, 139598425821184,101767252423643865, 101767252423643866000,135452212975869985647331, 234061424022303335198589696, 514232948577000427431301564309, 1411055210895289172871491492466640] |