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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 80 |
| 4 | 80 |
| 5 | 1215 |
| 6 | 16767 |
| 7 | 76544 |
| 8 | 636416 |
| 9 | 3995648 |
| 10 | 24151040 |
| 11 | 36315135 |
| 12 | 689278976 |
| 13 | 1487503359 |
| 14 | 1487503359 |
| 15 | 155240824832 |
| 16 | 785129144319 |
| 17 | 4857090670592 |
| 18 | 45922887663615 |
| 19 | 157197025673216 |
| 20 | 1375916505694208 |
| 21 | 2280241934368767 |
[1,8,80,80,1215,16767,76544,636416,3995648, 24151040,36315135,689278976,1487503359,1487503359, 155240824832,785129144319,4857090670592, 45922887663615,157197025673216,1375916505694208, 2280241934368767] |