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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 187 |
| 5 | 1128 |
| 6 | 8455 |
| 7 | 76359 |
| 8 | 806032 |
| 9 | 9715773 |
| 10 | 131479675 |
| 11 | 1972203654 |
| 12 | 32464248277 |
| 13 | 581680548543 |
| 14 | 11267985324970 |
| 15 | 234636397255299 |
| 16 | 5226203231564047 |
| 17 | 123980282579987688 |
| 18 | 3120721375925421715 |
| 19 | 83069463947823034419 |
[1,3,10,39,187,1128,8455,76359,806032,9715773, 131479675,1972203654,32464248277,581680548543, 11267985324970,234636397255299,5226203231564047, 123980282579987688,3120721375925421715, 83069463947823034419] |