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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 9 |
| 4 | 300 |
| 5 | 1455 |
| 6 | 44658 |
| 7 | 430941 |
| 8 | 13821048 |
| 9 | 213210171 |
| 10 | 7400153550 |
| 11 | 160981385433 |
| 12 | 6126989357844 |
| 13 | 173482562393751 |
| 14 | 7273217782923498 |
| 15 | 253885773923800245 |
| 16 | 11726322434886352368 |
| 17 | 485729504795911017075 |
| 18 | 24658741688798553168582 |
| 19 | 1179026561203600147075857 |
[1,0,6,9,300,1455,44658,430941,13821048,213210171, 7400153550,160981385433,6126989357844, 173482562393751,7273217782923498, 253885773923800245,11726322434886352368, 485729504795911017075,24658741688798553168582, 1179026561203600147075857] |