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| n | a(n) |
|---|---|
| 2 | 5 |
| 3 | 40 |
| 4 | 342 |
| 5 | 2941 |
| 6 | 25333 |
| 7 | 218659 |
| 8 | 1891683 |
| 9 | 16403283 |
| 10 | 142548639 |
| 11 | 1241293314 |
| 12 | 10829045472 |
| 13 | 94632148659 |
| 14 | 828235716571 |
| 15 | 7258991679448 |
| 16 | 63701900660206 |
| 17 | 559673483274827 |
| 18 | 4922447330226279 |
| 19 | 43336501329817600 |
| 20 | 381873520840930490 |
| 21 | 3367815295820010367 |
| 22 | 29724409053210972087 |
[5,40,342,2941,25333,218659,1891683,16403283, 142548639,1241293314,10829045472,94632148659, 828235716571,7258991679448,63701900660206, 559673483274827,4922447330226279, 43336501329817600,381873520840930490, 3367815295820010367,29724409053210972087] |