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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 68 |
| 3 | 1272 |
| 4 | 27346 |
| 5 | 585880 |
| 6 | 12582344 |
| 7 | 270096962 |
| 8 | 5799242344 |
| 9 | 124514793312 |
| 10 | 2673473185328 |
| 11 | 57402651030122 |
| 12 | 1232504863875396 |
| 13 | 26463395615097866 |
| 14 | 568201785697961358 |
| 15 | 12199995225532283910 |
| 16 | 261948999886945680148 |
[0,68,1272,27346,585880,12582344,270096962, 5799242344,124514793312,2673473185328, 57402651030122,1232504863875396,26463395615097866, 568201785697961358,12199995225532283910, 261948999886945680148] |