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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 49 |
| 5 | 710 |
| 6 | 19011 |
| 7 | 954184 |
| 8 | 90154415 |
| 9 | 16108626420 |
| 10 | 5481798833245 |
| 11 | 3582369649269620 |
| 12 | 4532127781040045649 |
| 13 | 11177949079089720090800 |
| 14 | 54050029251399545975868271 |
| 15 | 514598463471970554205910304780 |
| 16 | 9677402372862708729859372687791391 |
[0,1,6,49,710,19011,954184,90154415,16108626420, 5481798833245,3582369649269620, 4532127781040045649,11177949079089720090800, 54050029251399545975868271, 514598463471970554205910304780, 9677402372862708729859372687791391] |