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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 13 |
| 3 | 37 |
| 4 | 181 |
| 5 | 1621 |
| 6 | 19441 |
| 7 | 311041 |
| 8 | 6842881 |
| 9 | 171072001 |
| 10 | 4961088001 |
| 11 | 153793728001 |
| 12 | 5382780480001 |
| 13 | 252990682560001 |
| 14 | 14420468905920001 |
| 15 | 879648603261120001 |
| 16 | 58056807815233920001 |
| 17 | 4586487817403479680001 |
[7,13,37,181,1621,19441,311041,6842881,171072001, 4961088001,153793728001,5382780480001, 252990682560001,14420468905920001, 879648603261120001,58056807815233920001, 4586487817403479680001] |