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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 606 |
| 3 | 28828 |
| 4 | 856710 |
| 5 | 20051838 |
| 6 | 490925804 |
| 7 | 10666178322 |
| 8 | 218881780434 |
| 9 | 4439994180178 |
| 10 | 86144471693502 |
| 11 | 1647236588215940 |
| 12 | 30886611480481804 |
| 13 | 570240744935345282 |
| 14 | 10403840277141487378 |
| 15 | 187674700355041651540 |
[0,606,28828,856710,20051838,490925804, 10666178322,218881780434,4439994180178, 86144471693502,1647236588215940,30886611480481804, 570240744935345282,10403840277141487378, 187674700355041651540] |