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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 82 |
| 4 | 705 |
| 5 | 6584 |
| 6 | 64902 |
| 7 | 664608 |
| 8 | 7001006 |
| 9 | 75378082 |
| 10 | 825810304 |
| 11 | 9176278104 |
| 12 | 103171720299 |
| 13 | 1171558985630 |
| 14 | 13416903518301 |
| 15 | 154784357304138 |
| 16 | 1797153050309355 |
| 17 | 20984321920535966 |
| 18 | 246252819129444579 |
| 19 | 2902768234099178002 |
| 20 | 34355158795966317996 |
| 21 | 408086199665333171952 |
[1,2,11,82,705,6584,64902,664608,7001006,75378082, 825810304,9176278104,103171720299,1171558985630, 13416903518301,154784357304138,1797153050309355, 20984321920535966,246252819129444579, 2902768234099178002,34355158795966317996, 408086199665333171952] |