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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 15 |
| 3 | 45 |
| 4 | 91 |
| 5 | 231 |
| 6 | 325 |
| 7 | 561 |
| 8 | 703 |
| 9 | 1035 |
| 10 | 1653 |
| 11 | 1891 |
| 12 | 2701 |
| 13 | 3321 |
| 14 | 3655 |
| 15 | 4371 |
| 16 | 5565 |
| 17 | 6903 |
| 18 | 7381 |
| 19 | 8911 |
| 20 | 10011 |
| 21 | 10585 |
| 22 | 12403 |
| 23 | 13695 |
| 24 | 15753 |
| 25 | 18721 |
| 26 | 20301 |
| 27 | 21115 |
| 28 | 22791 |
| 29 | 23653 |
| 30 | 25425 |
| 31 | 32131 |
| 32 | 34191 |
| 33 | 37401 |
| 34 | 38503 |
| 35 | 44253 |
| 36 | 45451 |
| 37 | 49141 |
| 38 | 52975 |
| 39 | 55611 |
[6,15,45,91,231,325,561,703,1035,1653,1891,2701, 3321,3655,4371,5565,6903,7381,8911,10011,10585, 12403,13695,15753,18721,20301,21115,22791,23653, 25425,32131,34191,37401,38503,44253,45451,49141, 52975,55611] |