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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 95 |
| 5 | 921 |
| 6 | 11586 |
| 7 | 176324 |
| 8 | 3162447 |
| 9 | 65233120 |
| 10 | 1521743103 |
| 11 | 39609506223 |
| 12 | 1138093049808 |
| 13 | 35779807446670 |
| 14 | 1221719353617885 |
| 15 | 45025117385882889 |
| 16 | 1781345658408660655 |
| 17 | 75304205654268663567 |
| 18 | 3387556543611248410593 |
| 19 | 161575661076504392490150 |
| 20 | 8144909167115962980271095 |
[1,1,3,13,95,921,11586,176324,3162447,65233120, 1521743103,39609506223,1138093049808, 35779807446670,1221719353617885,45025117385882889, 1781345658408660655,75304205654268663567, 3387556543611248410593,161575661076504392490150, 8144909167115962980271095] |