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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 10 |
| 6 | 308574 |
| 7 | 81442802 |
| 8 | 5296005568 |
| 9 | 146127335256 |
| 10 | 2309813476870 |
| 11 | 24738873315596 |
| 12 | 198759048859008 |
| 13 | 1279605298916568 |
| 14 | 6906427308782106 |
| 15 | 32277449304595350 |
| 16 | 133788325435448576 |
| 17 | 500896430870051174 |
| 18 | 1718268150463137018 |
| 19 | 5462521782760829320 |
| 20 | 16243031089247644800 |
[0,0,0,0,10,308574,81442802,5296005568, 146127335256,2309813476870,24738873315596, 198759048859008,1279605298916568,6906427308782106, 32277449304595350,133788325435448576, 500896430870051174,1718268150463137018, 5462521782760829320,16243031089247644800] |