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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 173 |
| 5 | 2454 |
| 6 | 332147 |
| 7 | 37665879 |
| 8 | 774841151 |
| 9 | 1162263921 |
| 10 | 1937434592 |
| 11 | 2749609302 |
| 12 | 3486784574 |
| 13 | 3486786855 |
| 14 | 3487116548 |
| 15 | 3524450280 |
[0,173,2454,332147,37665879,774841151,1162263921, 1937434592,2749609302,3486784574,3486786855, 3487116548,3524450280] |