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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 247 |
| 9 | 14608 |
| 10 | 455192 |
| 11 | 9738114 |
| 12 | 162512286 |
| 13 | 2275172004 |
| 14 | 27971176092 |
| 15 | 311387598411 |
| 16 | 3207483178157 |
| 17 | 31055652948388 |
| 18 | 285997074307300 |
| 19 | 2527925001876036 |
| 20 | 21598596303099900 |
| 21 | 179385804170146680 |
[1,247,14608,455192,9738114,162512286,2275172004, 27971176092,311387598411,3207483178157, 31055652948388,285997074307300,2527925001876036, 21598596303099900,179385804170146680] |