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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 183 |
| 4 | 1785 |
| 5 | 18651 |
| 6 | 204141 |
| 7 | 2310447 |
| 8 | 26819121 |
| 9 | 317530227 |
| 10 | 3819724293 |
| 11 | 46553474919 |
| 12 | 573608632233 |
| 13 | 7133530172619 |
| 14 | 89423593269213 |
| 15 | 1128765846337887 |
| 16 | 14334721079385441 |
| 17 | 183021615646831587 |
| 18 | 2347944226115977461 |
| 19 | 30250309354902101271 |
| 20 | 391241497991342192985 |
[1,3,21,183,1785,18651,204141,2310447,26819121, 317530227,3819724293,46553474919,573608632233, 7133530172619,89423593269213,1128765846337887, 14334721079385441,183021615646831587, 2347944226115977461,30250309354902101271, 391241497991342192985] |