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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 17 |
| 4 | 1978 |
| 5 | 73 |
| 6 | 0 |
| 7 | 1570497 |
| 8 | 1009588832 |
| 9 | 7390478182 |
| 10 | 1391503283200 |
| 11 | 166394893969 |
| 12 | 151448237549551616 |
| 13 | 762517292682713 |
| 14 | 18685202394240778240 |
| 15 | 814227337406354049 |
| 16 | 187036938412352867328077 |
| 17 | 947615093635545799201 |
| 18 | 2095989269871299377743863001 |
[0,8,17,1978,73,0,1570497,1009588832,7390478182, 1391503283200,166394893969,151448237549551616, 762517292682713,18685202394240778240, 814227337406354049,187036938412352867328077, 947615093635545799201, 2095989269871299377743863001] |