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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 4 |
| 4 | 349 |
| 5 | 9985 |
| 6 | 213230 |
| 7 | 4000444 |
| 8 | 69940479 |
| 9 | 1170549895 |
| 10 | 19024433560 |
| 11 | 302846958634 |
| 12 | 4748624978009 |
| 13 | 73628721516805 |
| 14 | 1132119741733890 |
| 15 | 17298702716660824 |
| 16 | 263082403948681939 |
| 17 | 3986935934969727715 |
[0,0,4,349,9985,213230,4000444,69940479, 1170549895,19024433560,302846958634,4748624978009, 73628721516805,1132119741733890,17298702716660824, 263082403948681939,3986935934969727715] |