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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 1 |
| 4 | 143 |
| 5 | 19 |
| 6 | 1153 |
| 7 | 583 |
| 8 | 1616353 |
| 9 | 132809 |
| 10 | 134926369 |
| 11 | 46840699 |
| 12 | 67545496213157 |
| 13 | 4068990560161 |
| 14 | 411124285571171 |
| 15 | 1204567303451311 |
| 16 | 73419800947733963069 |
| 17 | 4146897304424408411 |
| 18 | 86773346866163284480799923 |
| 19 | 18814360006695807527868793 |
| 20 | 539741515875650532056045666422369 |
[1,1,5,1,143,19,1153,583,1616353,132809,134926369, 46840699,67545496213157,4068990560161, 411124285571171,1204567303451311, 73419800947733963069,4146897304424408411, 86773346866163284480799923, 18814360006695807527868793, 539741515875650532056045666422369] |