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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 77 |
| 4 | 543 |
| 5 | 3213 |
| 6 | 16673 |
| 7 | 86093 |
| 8 | 503815 |
| 9 | 3529057 |
| 10 | 25402097 |
| 11 | 162303510 |
| 12 | 884504882 |
| 13 | 4156234265 |
| 14 | 17270407962 |
| 15 | 65375131342 |
| 16 | 232901619970 |
| 17 | 807191392546 |
| 18 | 2795912956450 |
| 19 | 9796747697594 |
| 20 | 34556445906044 |
| 21 | 120898966116007 |
| 22 | 413105921852769 |
| 23 | 1363586516014222 |
[1,9,77,543,3213,16673,86093,503815,3529057, 25402097,162303510,884504882,4156234265, 17270407962,65375131342,232901619970,807191392546, 2795912956450,9796747697594,34556445906044, 120898966116007,413105921852769,1363586516014222] |