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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 49 |
| 5 | 201 |
| 6 | 2491 |
| 7 | 14743 |
| 8 | 266337 |
| 9 | 2055889 |
| 10 | 49051891 |
| 11 | 466650471 |
| 12 | 13873711633 |
| 13 | 156839920537 |
| 14 | 5591748678699 |
| 15 | 73222243463671 |
| 16 | 3046762637864641 |
| 17 | 45346835284775073 |
| 18 | 2158148557098011107 |
| 19 | 35980450963558606279 |
| 20 | 1928292118820446611441 |
[1,1,3,7,49,201,2491,14743,266337,2055889, 49051891,466650471,13873711633,156839920537, 5591748678699,73222243463671,3046762637864641, 45346835284775073,2158148557098011107, 35980450963558606279,1928292118820446611441] |