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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 65 |
| 4 | 699 |
| 5 | 8192 |
| 6 | 101538 |
| 7 | 1309007 |
| 8 | 17373825 |
| 9 | 235820907 |
| 10 | 3258327727 |
| 11 | 45676003435 |
| 12 | 648019627185 |
| 13 | 9286982935406 |
| 14 | 134247731827970 |
| 15 | 1955128344950960 |
| 16 | 28659409029300490 |
| 17 | 422517375650417841 |
| 18 | 6260750426764454787 |
| 19 | 93191618760715641120 |
| 20 | 1392823412892172416996 |
[1,1,7,65,699,8192,101538,1309007,17373825, 235820907,3258327727,45676003435,648019627185, 9286982935406,134247731827970,1955128344950960, 28659409029300490,422517375650417841, 6260750426764454787,93191618760715641120, 1392823412892172416996] |