| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 57 |
| 2 | 995 |
| 3 | 8683 |
| 4 | 48429 |
| 5 | 198677 |
| 6 | 653791 |
| 7 | 1825719 |
| 8 | 4494329 |
| 9 | 10016209 |
| 10 | 20601723 |
| 11 | 39670115 |
| 12 | 72292453 |
| 13 | 125732205 |
| 14 | 210093239 |
| 15 | 339085039 |
| 16 | 530914929 |
| 17 | 809317097 |
| 18 | 1204728211 |
| 19 | 1755619419 |
| 20 | 2509994525 |
| 21 | 3527064133 |
| 22 | 4879105551 |
| 23 | 6653518247 |
| 24 | 8955084649 |
| 25 | 11908446081 |
| 26 | 15660803627 |
| 27 | 20384853715 |
[1,57,995,8683,48429,198677,653791,1825719, 4494329,10016209,20601723,39670115,72292453, 125732205,210093239,339085039,530914929,809317097, 1204728211,1755619419,2509994525,3527064133, 4879105551,6653518247,8955084649,11908446081, 15660803627,20384853715] |