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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 83 |
| 4 | 660 |
| 5 | 5189 |
| 6 | 40670 |
| 7 | 318487 |
| 8 | 2493480 |
| 9 | 19520521 |
| 10 | 152816050 |
| 11 | 1196311643 |
| 12 | 9365243580 |
| 13 | 73315137869 |
| 14 | 573942237830 |
| 15 | 4493065034527 |
| 16 | 35173632302160 |
| 17 | 275354217434641 |
| 18 | 2155590425209690 |
| 19 | 16874882555708003 |
| 20 | 132103788328515300 |
[1,10,83,660,5189,40670,318487,2493480,19520521, 152816050,1196311643,9365243580,73315137869, 573942237830,4493065034527,35173632302160, 275354217434641,2155590425209690, 16874882555708003,132103788328515300] |