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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 274120 |
| 10 | 2819520 |
| 11 | 30530115 |
| 12 | 249109665 |
| 13 | 1650476520 |
| 14 | 8806726665 |
| 15 | 38261417997 |
| 16 | 136522171665 |
| 17 | 402352364565 |
| 18 | 983530112015 |
| 19 | 2001805012350 |
| 20 | 3403264592178 |
| 21 | 4842229755990 |
| 22 | 5773480681050 |
[1,0,0,0,0,0,0,0,0,274120,2819520,30530115, 249109665,1650476520,8806726665,38261417997, 136522171665,402352364565,983530112015, 2001805012350,3403264592178,4842229755990, 5773480681050] |