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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 3 |
| 5 | 46 |
| 6 | 11 |
| 7 | 1486 |
| 8 | 401 |
| 9 | 133777 |
| 10 | 19881 |
| 11 | 31874678 |
| 12 | 3357350 |
| 13 | 19385116046 |
| 14 | 1369262857 |
| 15 | 34450358764096 |
| 16 | 1726253429208 |
| 17 | 166321294438234974 |
| 18 | 5602768757076743 |
| 19 | 2202194423758663223078 |
| 20 | 51308572928072165575 |
[1,1,7,3,46,11,1486,401,133777,19881,31874678, 3357350,19385116046,1369262857,34450358764096, 1726253429208,166321294438234974,5602768757076743, 2202194423758663223078,51308572928072165575] |