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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 361 |
| 3 | 6859 |
| 4 | 130321 |
| 5 | 2476099 |
| 6 | 47045881 |
| 7 | 893871739 |
| 8 | 16983563041 |
| 9 | 322687697779 |
| 10 | 6131066257801 |
| 11 | 116490258898219 |
| 12 | 2213314919066161 |
| 13 | 42052983462257059 |
| 14 | 799006685782884121 |
| 15 | 15181127029874798299 |
| 16 | 288441413567621167681 |
| 17 | 5480386857784802185939 |
| 18 | 104127350297911241532841 |
| 19 | 1978419655660313589123979 |
| 20 | 37589973457545958193355601 |
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