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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 76 |
| 4 | 902 |
| 5 | 11635 |
| 6 | 192205 |
| 7 | 3450337 |
| 8 | 73128340 |
| 9 | 1696862300 |
| 10 | 44414258862 |
| 11 | 1264163699189 |
| 12 | 39640715859359 |
| 13 | 1340191402045395 |
| 14 | 49097854149726795 |
| 15 | 1924982506686743639 |
| 16 | 80831323253459088871 |
| 17 | 3607487926962810556542 |
| 18 | 170964537623741430399076 |
[1,1,9,76,902,11635,192205,3450337,73128340, 1696862300,44414258862,1264163699189, 39640715859359,1340191402045395,49097854149726795, 1924982506686743639,80831323253459088871, 3607487926962810556542,170964537623741430399076] |