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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 35 |
| 3 | 250 |
| 4 | 1795 |
| 5 | 12910 |
| 6 | 92910 |
| 7 | 668820 |
| 8 | 4815075 |
| 9 | 34667110 |
| 10 | 249598330 |
| 11 | 1797091180 |
| 12 | 12938997710 |
| 13 | 93160575500 |
| 14 | 670755400700 |
| 15 | 4829436210600 |
| 16 | 34771931021475 |
| 17 | 250357867996950 |
| 18 | 1802576519933250 |
| 19 | 12978550465880700 |
| 20 | 93445561587077850 |
| 21 | 672808036862840100 |
| 22 | 4844217840946181700 |
[1,5,35,250,1795,12910,92910,668820,4815075, 34667110,249598330,1797091180,12938997710, 93160575500,670755400700,4829436210600, 34771931021475,250357867996950,1802576519933250, 12978550465880700,93445561587077850, 672808036862840100,4844217840946181700] |