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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 181 |
| 5 | 2183 |
| 6 | 47773 |
| 7 | 1689841 |
| 8 | 90972682 |
| 9 | 6948008975 |
| 10 | 721121538707 |
| 11 | 98626660242232 |
| 12 | 17361164959413148 |
| 13 | 3857920886847174328 |
| 14 | 1064590883337392451345 |
| 15 | 359664321908847682542521 |
| 16 | 146924560811224485478212220 |
| 17 | 71778969194383385732028947007 |
| 18 | 41528817306107485906955040499799 |
[1,5,22,181,2183,47773,1689841,90972682, 6948008975,721121538707,98626660242232, 17361164959413148,3857920886847174328, 1064590883337392451345,359664321908847682542521, 146924560811224485478212220, 71778969194383385732028947007, 41528817306107485906955040499799] |