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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 27 |
| 3 | 56 |
| 4 | 91 |
| 5 | 112 |
| 6 | 156 |
| 7 | 355 |
| 8 | 988 |
| 9 | 8925 |
| 10 | 28518 |
| 11 | 36655 |
| 12 | 76999 |
| 13 | 132943 |
| 14 | 360432 |
| 15 | 683575 |
| 16 | 1412464 |
| 17 | 3430111 |
| 18 | 11097188 |
| 19 | 83623927 |
| 20 | 404412907 |
| 21 | 288039497527 |
[7,27,56,91,112,156,355,988,8925,28518,36655, 76999,132943,360432,683575,1412464,3430111, 11097188,83623927,404412907,288039497527] |