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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 113 |
| 5 | 1472 |
| 6 | 21375 |
| 7 | 330905 |
| 8 | 5348380 |
| 9 | 89188027 |
| 10 | 1522999490 |
| 11 | 26497322726 |
| 12 | 468008534344 |
| 13 | 8369663126451 |
| 14 | 151250089239576 |
| 15 | 2757670822707609 |
| 16 | 50665739960395844 |
| 17 | 937090326420476362 |
| 18 | 17433799590092921578 |
| 19 | 326028128575350241133 |
| 20 | 6125291348509146395197 |
[1,1,2,11,113,1472,21375,330905,5348380,89188027, 1522999490,26497322726,468008534344,8369663126451, 151250089239576,2757670822707609, 50665739960395844,937090326420476362, 17433799590092921578,326028128575350241133, 6125291348509146395197] |