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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 105 |
| 4 | 1264 |
| 5 | 13045 |
| 6 | 136063 |
| 7 | 1273961 |
| 8 | 11936399 |
| 9 | 95697853 |
| 10 | 800561388 |
| 11 | 5824237329 |
| 12 | 42821430074 |
| 13 | 277065391875 |
[2,10,105,1264,13045,136063,1273961,11936399, 95697853,800561388,5824237329,42821430074, 277065391875] |