| n | a(n) |
|---|---|
| 1 | 250 |
| 2 | 4586 |
| 3 | 51200 |
| 4 | 294568 |
| 5 | 1267754 |
| 6 | 4353482 |
| 7 | 12777540 |
| 8 | 32910110 |
| 9 | 77097762 |
| 10 | 165865332 |
| 11 | 335432460 |
| 12 | 639208042 |
| 13 | 1165096450 |
| 14 | 2034488164 |
| 15 | 3435664024 |
| 16 | 5608125804 |
| 17 | 8919812138 |
| 18 | 13812228622 |
| 19 | 20946412056 |
| 20 | 31084523896 |
| 21 | 45360185886 |
[250,4586,51200,294568,1267754,4353482,12777540, 32910110,77097762,165865332,335432460,639208042, 1165096450,2034488164,3435664024,5608125804, 8919812138,13812228622,20946412056,31084523896, 45360185886] |