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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 90 |
| 3 | 19089 |
| 4 | 16173999 |
| 5 | 1414293534 |
| 6 | 2802869044173 |
| 7 | 22551947376101055 |
| 8 | 213300662882056463637 |
| 9 | 4552155569894863857602445 |
| 10 | 6356674411068592198597993830 |
| 11 | 112761457122054803122314301920246 |
[1,2,90,19089,16173999,1414293534,2802869044173, 22551947376101055,213300662882056463637, 4552155569894863857602445, 6356674411068592198597993830, 112761457122054803122314301920246] |