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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 57 |
| 4 | 741 |
| 5 | 12244 |
| 6 | 245755 |
| 7 | 5809875 |
| 8 | 158198200 |
| 9 | 4877852505 |
| 10 | 168055077875 |
| 11 | 6400217406500 |
| 12 | 267058149580823 |
| 13 | 12118701719205803 |
| 14 | 594291742526530761 |
| 15 | 31323687504696772151 |
| 16 | 1766116437541895988303 |
| 17 | 106080070002238888908150 |
[1,6,57,741,12244,245755,5809875,158198200, 4877852505,168055077875,6400217406500, 267058149580823,12118701719205803, 594291742526530761,31323687504696772151, 1766116437541895988303,106080070002238888908150] |