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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 61 |
| 4 | 8554 |
| 5 | 2662095 |
| 6 | 5675111511 |
| 7 | 35072966294346 |
| 8 | 1096128160677176696 |
| 9 | 121691314711314375091217 |
[0,2,61,8554,2662095,5675111511,35072966294346, 1096128160677176696,121691314711314375091217] |