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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 21 |
| 5 | 45 |
| 6 | 105 |
| 7 | 171 |
| 8 | 231 |
| 9 | 351 |
| 10 | 465 |
| 11 | 561 |
| 12 | 741 |
| 13 | 861 |
| 14 | 1275 |
| 15 | 1431 |
| 16 | 1485 |
| 17 | 2211 |
| 18 | 2415 |
| 19 | 2775 |
| 20 | 3081 |
| 21 | 3321 |
| 22 | 4005 |
| 23 | 4371 |
| 24 | 5151 |
| 25 | 7875 |
| 26 | 8385 |
| 27 | 10731 |
| 28 | 11175 |
| 29 | 11781 |
| 30 | 13041 |
| 31 | 13695 |
| 32 | 14535 |
| 33 | 15051 |
| 34 | 15225 |
| 35 | 17205 |
| 36 | 17391 |
| 37 | 17955 |
| 38 | 18915 |
| 39 | 21321 |
| 40 | 22155 |
| 41 | 23871 |
| 42 | 24531 |
[1,3,15,21,45,105,171,231,351,465,561,741,861, 1275,1431,1485,2211,2415,2775,3081,3321,4005,4371, 5151,7875,8385,10731,11175,11781,13041,13695, 14535,15051,15225,17205,17391,17955,18915,21321, 22155,23871,24531] |