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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 65 |
| 3 | 986410 |
| 4 | 56874039553217 |
| 5 | 42163840398198058854693626 |
| 6 | 1011182700521015817607065606491025592595137 |
| 7 | 1653481537585545171449931620186035466059689728986775126016505970 |
[1,2,65,986410,56874039553217, 42163840398198058854693626, 1011182700521015817607065606491025592595137, 16534815375855451714499316201860354660596897289867\ 75126016505970] |