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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2097151 |
| 3 | 5228079450 |
| 4 | 727778623825 |
| 5 | 19137821912055 |
| 6 | 163305339345225 |
| 7 | 602762379967440 |
| 8 | 1142399079991620 |
| 9 | 1241963303533920 |
| 10 | 835143799377954 |
| 11 | 366282500870286 |
| 12 | 108823356051137 |
| 13 | 22496861868481 |
| 14 | 3295165281331 |
[1,2097151,5228079450,727778623825,19137821912055, 163305339345225,602762379967440,1142399079991620, 1241963303533920,835143799377954,366282500870286, 108823356051137,22496861868481,3295165281331] |