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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 43 |
| 4 | 649 |
| 5 | 12320 |
| 6 | 404154 |
| 7 | 16957301 |
| 8 | 805174011 |
| 9 | 38921113842 |
| 10 | 1816451773537 |
| 11 | 79799396735243 |
| 12 | 3267743403989063 |
| 13 | 124448560749072651 |
| 14 | 4413401558241969897 |
| 15 | 146147123072487323183 |
| 16 | 4533679418476771721737 |
[1,1,9,43,649,12320,404154,16957301,805174011, 38921113842,1816451773537,79799396735243, 3267743403989063,124448560749072651, 4413401558241969897,146147123072487323183, 4533679418476771721737] |