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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 73 |
| 4 | 649 |
| 5 | 5257 |
| 6 | 46729 |
| 7 | 378505 |
| 8 | 3331721 |
| 9 | 27219593 |
| 10 | 237491849 |
| 11 | 1938544265 |
| 12 | 16925054601 |
| 13 | 138041874057 |
| 14 | 1196384310921 |
| 15 | 9820024329865 |
| 16 | 84609648809609 |
| 17 | 693596417152649 |
| 18 | 5977550934234761 |
| 19 | 48976660041553545 |
| 20 | 419984680697190025 |
| 21 | 3455551232025810569 |
| 22 | 29494747047731910281 |
[1,1,9,73,649,5257,46729,378505,3331721,27219593, 237491849,1938544265,16925054601,138041874057, 1196384310921,9820024329865,84609648809609, 693596417152649,5977550934234761, 48976660041553545,419984680697190025, 3455551232025810569,29494747047731910281] |