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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 153 |
| 4 | 3579 |
| 5 | 101630 |
| 6 | 3288871 |
| 7 | 116951012 |
| 8 | 4465824585 |
| 9 | 180310624841 |
| 10 | 7614208325878 |
| 11 | 333613510494834 |
| 12 | 15075162152856423 |
| 13 | 699290488810583617 |
| 14 | 33176816563410874752 |
| 15 | 1605135467691243954419 |
| 16 | 79003021319962788395355 |
| 17 | 3947913343912428255683930 |
[1,1,9,153,3579,101630,3288871,116951012, 4465824585,180310624841,7614208325878, 333613510494834,15075162152856423, 699290488810583617,33176816563410874752, 1605135467691243954419,79003021319962788395355, 3947913343912428255683930] |