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| n | a(n) |
|---|---|
| 0 | 21 |
| 1 | 43 |
| 2 | 365 |
| 3 | 3693 |
| 4 | 4058 |
| 5 | 7751 |
| 6 | 11809 |
| 7 | 19560 |
| 8 | 31369 |
| 9 | 50929 |
| 10 | 82298 |
| 11 | 133227 |
| 12 | 1414568 |
| 13 | 11449771 |
| 14 | 24314110 |
| 15 | 1032642391 |
| 16 | 2089598892 |
| 17 | 17749433527 |
| 18 | 179583934162 |
| 19 | 197333367689 |
| 20 | 376917301851 |
| 21 | 574250669540 |
[21,43,365,3693,4058,7751,11809,19560,31369,50929, 82298,133227,1414568,11449771,24314110,1032642391, 2089598892,17749433527,179583934162,197333367689, 376917301851,574250669540] |